Yay art! I hope you keep posting more.
First one looks good. The far back finger looks oddly rectangular, you didn't have that problem anywhere else. The pinkie isn't showing, which is possible, but that would be a rather awkward and unnatural pose. The lines are big and bold, and I don't see many areas where they look sketchy.
You are doing a fine job recreating the cover. I think her rear end could be a little more robust, but just slighty. That would give you the curve of the back of the dress. Also in the back, the bottom portion of the dress connects to the middle portion in a different way than what shows up on the cover. But you might not be trying to perfectly replicate the cover, that's cool. My only suggestion then would be to clean up the line work, especially near the bottom of the dress.