It might be a problem for you that you're doing celebrities. Because for many, when drawing celebrities you get too caught up in how they look rather than anything. So you kind of forget other things in the study. Although the likeness is important because there's a lot of structure to keep in mind but it can be a bit overwhelming.
They looks pretty good though, especially that recent one. Good job.
You should start doing some painted studies of faces as well as I see that as the bigger weakness. You rely a lot on line and whenever you lay in any tone, I can see that it's dragging behind. Even though you might want to go with the comic book style, the linework would still improve if you would spend some time with that too.
It's good to see more full figure studies and landscapes from you, they're showing you're stepping out of your comfort zone a bit more. I love the trees in the last post, hope you do some more colour works soon, they're lovely. :'D
The first one is inspired by the Glee version of Coldplay's "Fix you".
And the second one is Mick Angel from the book "Angel of Vengeance" by Trevor O. Munson. I realise that his looks are similar to those of Mick St.John. Since the book inspired "Moonlight", I can't separate them.
"It's not about perfection, it's about improvement."
Ah! I see you love them drawing memes too! I always want to do one then I get distracted.
And also, loaaads of pictures since I last checked by! The lips are showing good form and it's nice seeing you're drawing things that interest you /along/ with studies. Not much constructive to say, I'm afraid. Just keep up the good work, mate!