Blimey mate, what a lot of progress!
That is coming along nicely. YOu're right about the back of the legs, but that can be fixed by building up putty in the kink until it is straight again. The cloth looks smoothly finished and that is great. In terms of future stuff, my suggestion would be that next time you do this you make a real effort to keep the hem of the robes tidy. Then you can add folds around that area more realistically, and it saves you doing so when it has cured. To stop the thin putty sheet sticking where you don't want it to in future, try sticking it to the cork where you want it. and use that as a brace to avoid the problem. This isn't always useful, but when it comes to floor length robes, I think it could be a useful thing to bear in mind. I know that some of the guys at GW swear by it.
This is looking good dude, I mean it. The thing that would improve this most of all is if you work on your little folds around where the belt would go, where the fabric would be stretched, bunched or raised from the body below. That comes with practice though, don't in any sense be disheartened, this is already better than some professional sculptors frankly, keep plugging away! I think the addition of a belt would help break up the monotony of the robes for you, if you decide to go that route, and this week you'll be able to work on the chest some more

Don't let it get swallowed up by those wide sleeves, keep your proportions accurate
Great stuff!
James