Mountain at Sunset

Are you meaning you think your colors are TOO bright? Did you prep your canvas with liquid white? I know this is your second painting and it takes some time to get used to the techniques. If you forget your liquid white, you will also use a lot more paint.

This one was actually done with liquid clear. It mainly happens when I put highlights on trees and bushes. I have to use a lot of paint for the color not to blend with the darker color underneath it.

I definitely struggled with that for a while. After trying a lot of things - including thinning with liquid clear or waaaay too much paint thinner - I realized that liquid white is the way to go. If you can catch a video where Bob explains what he is doing, you will sometimes see that he will dip his brush into the liquid white and then tap tap tap into his highlight color(s). You should see it look like 3-D little paint peaks on you palette. Then you know you have enough paint on your brush. I lightly tap on the highlight color. Keep moving your brush. Don't keep applying in the same area or you will get mud from the colors mixing too much. Hope this helps!

Use very light pressure and think about shape and form. No matter which brush I use for highlights I'm almost always just using the very tip of the brush. It helps place your highlights exactly where you want them.