Dang it, Anna, see what you've done? After posting so much of your art on your lj, you made it, you made me create a deviantART account so I could pester you through comments and awe at your pics. lol Heck, I need to start to figure this thing out so I could start posting some of my (crappy) art too.
First, she's not fat, she's normal!
If I was shaped like her, I'd become a narcissist.
Second, her thighs aren't big, they're toned. Big difference.
Third, I love the colouring and the clean linework. I'm seriously jealous, especially about the colouring; I can't colour crap with a computer.
You're great! Keep it up!