Work more on the construction. Many of his proportions are wrong. Looks like you haven't done much life drawings because u're applying shadow/light not as u should do. U have to have the darkest shadow and the lightest light, but many of your tones looks the same.
And the most important part is composition: u just cut the guys head and legs. U can't do this in figure drawing, learn composition- do more cast drawings and so on. And then jump into the figure drawing, because it's really difficult part of art education.
And yeah; learn materials Right now his skin doesn't look like a skin
i think this is a bit of an unfair critique.
i think his use of tones is excellent. there is great contrast between darks and lights. many of his tones don't loo kthe same to me.
The model is a chinese man, i think the proportions are quite accurate. the only thing i'm not sure about is the thigh.
i think your not giving the artist enough merit, however i do acgree on composition, it would have been nice to see the rest of his head.
It's not about the contrast, but more about right graduation with keeping dark and lights as they need to be. [link]
This is great example of a figure drawing. I'm not saying that the artist have to draw like this right now, I'm trying to help by pointing out the mistakes and telling to what work more on.
It doesn't matter what race the model is, when we are talking about construction and building the figure.