this is my best painting and id like to ear your opinion/critic about it.
I think it's good so far. I do see a few issues though. To my eyes it looks like you're missing parts of the left side of his face (on our right). The unbroken line of light that travels from his lip to his neck isn't helping things. And I'm not sure, but it looks like his left eye is a little bit farther away from his nose than his right eye.
The polish in the shadow region isn't bad. The rim light is definitely too uniform and graphic-looking, which is flattening the face right now.
Biggest issue is construction though. Assuming human-like anatomy, the eyes right now are drifting to the sides of the head and downwards.