I think the colors by themselves are fine. You might be able to make them less dark by adding a bit of indirect lighting here and there in the shadows. What I do feel might be necessary is to have those green leaves on the left be a bit brighter, or at the least be a little more defined than the background so that the whole background doesn't feel quite as flat.
Did a quick paintover to give you some ideas. I agree with Wolthera's critique that the leaves to the left flatten out with the background, resulting in what I think is my biggest issue with this piece - it feels like it's missing some layers. It basically has the bird/branch, and then the background, with not much inbetween.
I also think the bird could do with a bit more work to make it pop - I strayed from this in my paintover, because I didn't know if the bird was intended to look a bit cartoony or not:
Don't be afraid to give things some sharpness & definition - even some of the specks in the light, for example.
Yes, I see what you mean. I was just afraid that the leaves would take all the focus away from the bird, but I guess it looks fine. Wolthera, Two Listen, thanks a lot! And happy New Year!
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I also think the bird could do with a bit more work to make it pop - I strayed from this in my paintover, because I didn't know if the bird was intended to look a bit cartoony or not:
Don't be afraid to give things some sharpness & definition - even some of the specks in the light, for example.
And happy New Year!