Nice and grey atmosphere, good use of vignette.
But you should work on your smoke. It’s just a smudged blob of light and dark grey… Why is there even dark grey there? Smoke hardly has any shadows, and when it does the shadows are much more light unless there is a strong source of light on it.
The match doesn’t look like a match either, just a crudely drawn white stick, might want to look up a reference or something the next time you’re going to draw stuff into a picture.
It would probably help if you made the Sniper look a bit more badass in the eyes, rather than slightly surprised, would fit the mood more.