Ok this isnt that bad to start with

but just a good comment won't help a lot so here is some advise ^^:
Starting with the girl, her left arm now moves outwards, like a "J" -shape, whereas it should go more like the other way around. Another thing to note about her arm is that if she has that pose she probably has her elbow somewhat closer to her side (now its "<" and I'm looking for "(" -shape). Then the hips, her hips should come out better, at the picture her legs bend below her hips, move the bend up. I think that will do the trick.
Now the sin, his pose looks like its seen from the side then changes at the belly, and changes again at the pants.. this one is easily fixed, make the gem on the pants match with the middle of the chestarmor ^^ (changing the chestarmor has the better effect). Now for his chest.. its huuge, I mean hes nearly a bodybuilder... this fits a gladsarmor warrior better to be honest

I'd make the chest-belly difference not that big, eating some off the chest and a bit off the belly (leave some difference to make him muscled still though).
A last hard to fix thing, as I don't know how to do it well from this view... the chestpiece now looks as it should look when u look at it from near-front view, while u have to look at it from a lower point of view. Try and make it match the pants-line.
Note: I'm not the most flawless artist either

I just try to help out, if you dislike critics (seen someone who dislikes critics on another forum) just tell, and I'll stop