Anatomy Feedback for 3D Character

TimmySib

Hi Artists!
Could you please give me small feedback on this character?
If it is alright, I will continue with the retopology stage
I am personally a little bit unsure about his back, so probably I will have a deeper look into it. 

carvuliero

Yes back could use a bit more attention more specifically add scapula and abs could use some variety in side view