As a big BL fan, I immediately recognized Revy in the thumbnail, but quickly judged your wall as 'yet another cheap and crappy Black Lagoon wall' for it's simplistic look. The last moment before I took my eyes off the thumbnail though, I spotted your name and thought "hold on, there's got to be more in this wall if it's made by Beckor".
To make a long story somewhat shorter, I full viewed this wall and came to the conclusion that my first judgement was actually pretty accurate. I hope you still appreciate some well structured feedback, so here goes:
First of all the vector is quite bad. It's not amateuristic, but it lacks a certain amount of depth (gun holsters), detail (gun and hand) and finesse (line thickness). Some extra layers instead of a gradient overlay or lighten/burn tool would've looked better. The lines used are a bit too thick imo, it looks ok on the hair and clothing (although bottom skirt is a bit too thick as well), but the hand and gun are quite dramatic. Especially the gun ruins a lot, because it has a slightly wrong perspective, which is caused by the lack of extra layers that could accentuate the level of depth a bit more, plus supply some more details. I know Photoshop doesn't really offer anything to make lines look better and sharper, so I reckon you did made the best out of it.
Then the background. It's a bit grungy, a choice you made, I can live with that although I'd be more interested if it were cleanly vectored as well. Most disturbing though is the 'empty' yellow box. Why on earth did you make it yellow-ish? The whole bg has a violet-based color scheme and that yellow piece is disturbing everything!

Ah well, let me not put anymore stress on your 52 hour workweek suffering body. It's nice to see you're still in action, I really hope to see an A+ quality wall of you again soon.