I have to say first that your style is very unique and it makes your art really pop out. I love the first one, her dress is just gorgeous, but she looks a bit too thin.
For the second, well the idea behind her design looks like a great concept, her head and hair are just too big for her body to support. So you might want to either shrink her head or enlarge the rest of her body, probably a mixture of both. Once that is done she will look absolutely stunning.