This photo is pretty alright, however, I know some ways that you could really improve it on. I think maybe changing the angle at which you are looking out could be modified to where we see more of what you are looking at. Perhaps tighter on you to where it's over your shoulder and a wider view of the background. And finally, you could mess with the contrast of the photograph to really define more of the details.
Overall this isn't a bad photograph, nor is you costume bad. I actually really like the costume. I'm just curious to what your character could be looking at.