My Deviant Art Page

I tried browsing through other people's works, but there are many I couldn't access. So I don't know if the art I'm uploading would work the same way as they did. So I'm simply going to link my images from my deviantart page, just so I wouldn't mess up.
http://jasonpark1987.deviantart.com/gallery/
I haven't uploaded my artwork on deviantart for a very long time. but after getting my new tablet, I'm starting to focus on digital art, so I'm still improving.

If you're looking for critique I'd say you're shooting yourself in the foot by making flat angled no-background drawings. Maybe try experimenting?

As a general advise, you can probably use some gesture practice. Some observation is that you might want to look out for the location in which cheek starts in relation to a character's eyes. It might stand out when character is shown in 3/4 view.