I notice that you possess a good technique for illustration and painting. You can achieve smooth good detail and very interesting effects. I particularly like the gritty (and a bit grunge) atmosphere that you accomplish in this artwork.
Now, in your study of color, it gives me the feeling that, although sketches, the postures of the figure are better achieved; the character is tense, alert, searching a way to get in the building, while in the final posture, seems to be more relaxed, almost appreciating the landscape.
In my opinion (i'm no expert), the only thing that you might need practice is to achieve more loose, gestural drawings, and perhaps expermient with more dynamic perspectives.
Beyond that, I would like to see more of your work.