This is quite the piece of work. You need to go back and review some more of the art foundations before you work on rendering man
The anatomy seems to be really off, especially on the head. The perspective is really weird at points and you appear to have too many light sources (I don't know of too many artists that commonly use more than one major light source in their pieces). The pose is also very annoying to read and doesn't have a clear silhouette, causing a bit of confusion when you first look at it
The TL;DR of this is that you really need to work on your foundational skills before you start to rely too much on fancy effects like lens flare and glow. The use of those as a crutch will really hamper your growth as an artist