Oh wow, thank you very much for that! Yeah you're totally right and I'm still working on learning color and composition. But its nice to get some feedback = )
It's better than your previous work, but your main issue is still flat and washed out colours, a lack of contrast, and the fact that your colours don't convey the shapes you want them to. You also have a lot of extra colours, which makes it harder for you to rapidly adjust the colours, because doing so brings out a lot of isolated pixels (noise) which you need to adjust manually.
Be diligent in using as few colours as possible. It's not a limitation, it's a tool that makes it easier for you to make adjustments.
Beware of jaggies on the wings of the bird.