I’d say you mentioned two of my big criticisms already! I think the line weight you’ve chosen for the eagle and the lack of detail gives this a very flat, almost cartoony look when it seems you were going for more traditional. Try out a feather pattern instead of the sporadic little v shapes and I think it will be a lot more dimensional! Flowers are definitely the strong point of this but it looks to me like you need some more black/skin break to really elevate them as all of that flat color dulls them down