the back leg looks awkward but not sure what to do to fix it.
vrt will for sure be able to give you better help, but for me the problem is that the legs are not parallel and it looks like the leg has some degree to to inner side. Didn't know how to explain myself.. just a sketch what I mean:
Also, I guess the knee needs to be moved a bit to the upper right to have the same angle as the other leg.
Hope this helps somehow.
I agree, the awkwardness of the leg on the right looks like it is bent at the wrong angle, or it is being lifted up or something not intended. The foot of it is also shown at a slightly different angle which is throwing it off some. Or so it appears. it might look better once it is cleaned up more since it is sort of hard to tell with the smudging still there.
On the knee(on the top portion of it), it has a backwards curve on it, which is weird when compared to the closest knee. You have the curve facing the bottom left when it should be facing the top right.