This picture is awesome except for some of the gun proportions, but I like that Haruka has a knife on her kevlar vest and Yukiho's overpowered shovel. 
Ok I'm not terribly good with guns and please tell me if I'm wrong, but the weapons issues are:
1. The M4 Carb's vertical dimensions are too large.
2. The M4 Carb's stock is too short.
3. The M4 Carb stock is not being pressed into her shoulder, possibly related to its inaccurate size and proportion.
4. The M4 Carb's grip is not long enough.
5. The M4 Carb's magazine curve is slighty exaggerated.
6. The M4's recoil-reducing backwards firing gas thing (forgot what it's called, a dampener?) is also too tall (vertically).
7. The MP5 PDW is too large and its magazine is slighty too short for the angle it's being held at.
8. The shovel head is too small.
9. Haruka's pants appear to be too tight.
10. Why is the team medic dressed like a pokemon nurse.
Did I miss anything significant? Weapons people please let me know.