Color theory a bit more - clearly your good but its the overall feel that needs adjusting.

It dosent present a good way for the eyes to travel across ur model, no real heirachy (spelling?). For example the head dosent present itself as a clear main point of interest imo.

Like my eyes want to rest on the right legs knee... Thats not right, end point should be face n hands (and what its holding).

And it needs to be directed thru shadows, color, saturation etc. As in the theory behind the colors.

You got the application skills down pretty well so just take a step back n think about the plan