The Melvin sculpt looks pretty good as far as I can tell. Nice proportions, smooth surface.
The face sculpt looks good, too. I don’t know what you’re referencing, but maybe the corners of the jawbone are a little on the slim side. The nose and forehead are also quite straight. The neck from the front looks thinner than from the side, too. But again, I don’t know what you’re referencing, so take this with a grain of salt. Good work so far.