These are quite cute, and they lots of potential!
I think the 1st pose is the best, but they are all pretty good.
Just clean uo your lines a bit, and work on the clothing a little more, and they should be great!
I think the first one is good as well. Have you tried painting digitally? The drawing would look even better with some color, even flat coloring. You can easily outline and fill with just your mouse by using a curve tool and bucket tool.