Watercolor Galaxy Painting Mistakes to Avoid

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If you’ve ever watched a watercolor galaxy tutorial, it looks so easy. Just blend some colors together, right? So why does your painting keep turning out so bad? Read about some mistakes to avoid when painting so that you create gorgeous watercolor galaxies.

Want to learn more? Check out my other watercolor tutorials.

pin image - watercolor galaxy painting collage

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You might like this post on the best watercolor brushes for beginners.

Here’s how my galaxy paintings normally turn out. This is a quick version that I did in my sketchbook. There are many issues with this painting, but I think I was able to fix them all in the versions later in the post.

galaxy painting in sketchbook
My usual results for painting galaxies

Mistakes to Avoid When Painting a Watercolor Galaxy

  1. Not using enough water. Add a thin layer of water to the entire surface when starting a galaxy painting. This helps the paint move and blend into the other colors.
  2. Diluting the colors too much. If the color is too light, you will need to add more layers. Start with a medium tone instead. Keep in mind that the paint will dry lighter than it goes on.
  3. Not taping your paper down. Painting a galaxy requires a ton of water. Tape your paper to avoid buckling.
  4. Using cheap paper. Cheaper paper will break down with all that water. It might be time to open that expensive pack of Arches that you’ve been hoarding…
  5. Using too many colors. This might be a personal preference, but my favorite galaxy paintings use a limited color palette. Use pink and purple. Or blue and gray. Not the entire rainbow. In my examples, I’ve added a few contrasting colors as accents instead of using them throughout the painting.
  6. Using white watercolor paint for the stars. White watercolor is too transparent to use to make stars. Instead, use white gouache or acrylic paint with a toothbrush. (Unless you have a very stead hand, painting the stars results in wonky blotches.)
  7. Covering the whole area with paint. Leave an area somewhere in the middle to stay lighter. This gives the painting more depth.
  8. Using straight black paint. Instead use mixtures for black or even Payne’s gray. Black is just too harsh and opaque.
  9. Not adding layers. Let the first layer dry completely and add more layers of watercolor to build the color up.
  10. Blending too much. The best galaxy paintings use a wet on wet technique. When you drop color into a wet area, the paint will flow on its own. If a watercolor bloom occurs, it just adds to the effect.
  11. Painting in straight lines. Nothing in nature is straight. Use organic shapes instead.
3 different paintings of galaxies using watercolor paint
Paintings I created using these tips.

More Tips for Creating a Watercolor Galaxy

  • Use a toothbrush to flick white paint for all over star coverage. It looks more realistic than trying to paint individual stars.
  • If you make a mistake, wet the area and remove as much of the paint as possible with a paper towel.
  • You can try adding salt while the paint is wet. As the paint dries, it creates small light spots where the salt was. Use this effect sparingly for the best results.
  • Paint the edges darker and keep the center lighter for the most part.
  • Use granulating paints for interesting effects. Daniel Smith makes a ton of interesting colors that produce interesting effects when they dry.
  • When peeling the tape away, pull it at an angle close to the table. This prevents it from tearing up your paper.

Supplies I Used

Watercolor Paints Used

I mostly used Daniel Smith paints that are in my custom palette. I’ve made notes when I used a different brand.

Purple and Pink Galaxy

purple galaxy painting

Blue Galaxy

blue galaxy painting

Pastel Galaxy

pastel galaxy painting

I diluted these colors to make pastel versions.

purple galaxy painting
Yield: 1

How to Paint a Watercolor Galaxy

Prep Time: 1 minute
Active Time: 10 minutes
Additional Time: 5 minutes
Total Time: 16 minutes
Difficulty: Easy
Estimated Cost: $5


  • Watercolor Paint
  • Watercolor Paper
  • Paint Brush
  • White Gouache
  • White Gel Pen
  • Masking Tape


  1. Use masking tape to tape your paper down. taping down watercolor paper
  2. Add a thin wash of water on the entire surface. adding water wash to watercolor paper
  3. Start dropping in color, letting it spread on its own.dropping in purple watercolor paint onto wet surface
  4. Add another color next to the first, letting the colors mix. adding dots of pink to the purple paint
  5. Add more colors as needed.paper covered in watercolor paints in purples and pinks
  6. Leave a white spot somewhere in the middle.
  7. Cover the page, besides the white spot.
  8. Let it dry completely. dried base layer of watercolor painting
  9. Add another layer, adding colors on top until you're happy. 2nd layer of paint on watercolor painting
  10. Let dry completely.
  11. Use watered down gouache and a toothbrush to flick white paint across the surface to create stars.
  12. You can also add stars with a white gel pen. using white gel pen to create stars
  13. Remove tape from paper.purple galaxy painting


For added interest, use granulating paints.

Did you make this project?

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pin image - purple and blue galaxy paintings

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