I think Vlad is right so I'll answer this as gentle as possible.
I think the model itself as a whole looks a little untidy in its appearance.

Proportion wise, to me it looks way off, starting with the arms, they are too short. The groin area, doesnt join to the testicular region like you have, they (testicles) are almost a separate entity, the tendons for that area reach upwards and toward the crotch area. If the guy is suppose to be fat the arms are too muscular. round them off more the bicep is almost square on the model, the face itself is a little out too. The distance between the top lip and nose is too far apart, if its a caricature fair enough, but it clearly isnt what you're going for. The lower eyelid is too thick, the lower lid has depth but not that thick. The eyes do not look centred to me either on the head, they should be around the halfway mark, give or take a couple of mil. The mouth area needs attention, the jowls are too far forwards andthe mouth looks flat across the front. Also the fat on the hips, round that area more as theres some strange lumpyness going on. His chest would be bulkier too, hed almost have minor breasts wouldnt you say? is the head 5 eyes width across? as the eyes look huge too.

As far as the texturing goes, drop the bump down its too harsh. As for the scarring across the nose get rid of it as it just looks like bad uvs, you want to impress somebody with it not frighten them away. I would do this model as an anatomy study only, not put the scars on it. The bump on the veins in the arm goes inwards, I think bumpy veins should stick out.

I hope this can help you improve this model. Its an honest opinion, no gloss. I understand what you aretrying to do as I do this sort of thing daily, and its a hard thing to get right. We are so used to looking at ourselves, and this is what causes the problem.

Best of luck again
Jay