I think you have a good start there. Good that you started with multi tile too.

Few suggestions:



The chest/torso is sucked in in the wrong place. Obviously you weren't going for super realistic like the model, but even the cartoony stuff has a base in reality. I puffed it out where it gets sucked in on yours so that it's the waist/lower torso that is the thin part. The feet were really big so I toned them down a bit as well. Also, his underwear was looking a little pulled down like a bad underwear model, so I pulled them up and made sure they contoured to the shape of his body. I didn't really get into the colors much, but I will say contrast will help you. Also some AA for the outer edges, and watch out for the pillow shading and banding.

Hope it helped.