By tweaking he means moving around vertexes untill you get a slightly better look.

Looks great. I think you've got really good defintion around the eyes/nose region, especially for your fist one. Also, I like the squared look he has. It gives him a lot of character. Good job.

so tryed to do model the body but it's awful. Need some suggestions to do the body. Stomach muscles don't look real.

That is looking very good .... :D

A LOT better than my feeble attempts... Keep it up Scraggy