Sorry for the late answer, i just forgot about this x)
I draw a lot more birds latelly and that helps me a lot, you are right about the big problem (didnt look like a raven) and it was because of the horrible anatomy that I did. This is the last one:

As you can see, the big improvement is about the natural pixel line, but it still is the big problem. I cant make the back going under in a natural flow, or it turns 45° or it just doesent look good. And for the shadows concern, I try something like this:

anyway, any edit abut that would help me a lot
thanks for the reply
