Yay!
I'm always happy to see another ghost rendition!
The facial structure could gain in realism if you gave it a more pronounced, pointy chin. It would still come out as feminine if you don't put too much emphasis on the lining of the jaw.
The pose is mostly good, but a weapon (especially a sniper rifle) is never fire like a pistol and should require both hands to be held upright, and the stock should rest against the shoulder. Aiming through a scope also requires the eye to be much closer to the eyepiece.
These things aside, it's an interesting. Keep working on your technique, you seem very promising.
Cheers!