Welcome + thanks for sharing your art.
Overall I like it. Also like the gunshot fire. Looks realistic.
I have a few minor issues that when I studied it more, bugged me. A normal sniper rifle would be to large for a young girl to handle effectively. Almost appears that it may have been scaled down. Being against a "country" house Id have expected a shotgun or a hunting rifle. Looks a bit to military. She also looks like she outgrew the tricycle and would have problems driving it while carrying a rifle.
Im sure you ment the storm to cover/mask the kids but I would have liked to seen more detail bleed through. I still like it but, Im overly picky.