This is certainly not the best illustration for this trope: one gun is hidden by the smoke, and the other is cut ofd by the frame. Plus it's just a bit too dynamic.
We certainly can find something better.
You'd think this would be one of those tropes that would be easy to find an image for.
The current image doesn't seem absolutely awful but I see your point. There are definitely better images of girls with guns out there.
Here's an image of the anime Gunslinger Girl,◊ for one. (Note: not a suggestion for a replacement.)
Another flaw of the current is that it's one person and this is a genre that focuses on female leads with guns. There's SCC◊. We'd have to take off the title at the top. Why not use something from Gunslinger Girl? ◊ ◊
The character page images aren't quite the same format, plus they're split up, plus they're hidden in folders. I think it's okay.
With that many votes (including my own), it's up, potholed, and tagged.