I like the Serenity piece on a whole, but a few things stand out:
1) You're re-using the pose from Safiria, which apparently you reused from something else. Not necessarily a bad thing, and it's not exactly the same, but it's noticeable.
2) Her chin shading is weird. As someone who has unsuccessfully attempted to shade like that before, I completely understand.
3) I like Valtrith's tongue-thing. That's imaginative.
4) Color/shading are generally good.
I don't know anything about weapons, so I'll leave those to someone who does.
Keep up the good work!