From the video I added a light green wash. Then I put a red wash over the dragon and a brown wash over the dog. I then took a bit of brown mixed with blue and reinforced some shadows here and there. Also added yellow in a couple places like the dragon's eyes.
See how the blue and yellow from earlier are adding lots of color variety, especially in the red of the dragon? It makes the image much more interesting than if it was just solid blocks of red paint. I'd be fighting to put that color back in later and wondering why things don't have any depth. This is why things I have tried to paint in the past looked awful. I'm focusing on value first, then color variation, then the actual color of objects. If I get better I won't have to use this process I think, but, I don't really think like a painter at all. Painters practically sculpt with color. I'm not in that mindset yet. I just draw because I don't know any better.