Rivina's leg is extended one pixel outward and away from her body In the image provided in the link. I agree it looks out of place and awkward. However, I want to see the leg extended inward towards her body. This would mean the gap between her legs and thigh would decrease, and hopefully it will look more natural.

I hope this helps. Also, try out what mioscene suggests too. Try to find the best that suits you.

It looks really cool! I think one problem with the legs is that they look like they're pointing a little too inward? With the direction her body is pointing, I think it might work better if her left leg was being veiwed at an angle closer to the one her right leg is being seen at!

I tried, but it doesn't look right: https://s18.postimg.org/dl4oxberd/Rivina_Sprite_2.png

It's a good sprite. Her right leg looks fine, but I would increase the width of her left leg and foot by one pixel.