The best tips I can give about doing likeness, are: learn anatomy, get tons of reference images and practise alot. Also watch some good tutorials.
About rendering, I'd recommend you watch some tutorials.
really captures your attention from all the pictures above. I was like he seems familiar in name and face. who is that?? because you know sometimes you see a
model on here and it's like ok I'll look. I checked online and realized immediately who it was. awesome work. wonder he himself would say?? keep up the great work.