Wow, thank you so much for all the tips and tweaks. I find amazing how a simple change on the curve of the skirt makes it so much more natural. And shame on me for overlooking the first thing that I learned about drawing women: boob shape/sag. As soon as I have some time I will study carefully everything that you changed.
About the buckle... the only reason why there's a buckle in this picture is because the waist line was looking weird(empty?) without it and I didn't knew how to fix it. I'm still trying to get rid of it, I just don't know how.
And the white line on the glove is supposed to be a cutout. Something like this:
Once again, thanks for everything!