Looking very pretty! You've really got Isabella's demeanor/expression down...
If you don't mind me saying though, she looks a tad bit too slim for Isabella. That's not to say that Isabella is heavy or anything, but rather in the game her curvy-yet-athletic-enough "mom" physique is what tends to lend to her believability of being 18 years older than our boy. The physique you gave her here makes her look like she's still in her 20's...unless of course this image is a throwback to her days of being in the O.M.G. sorority.
Again, excellent work...you've got some real potential for some splendid Isabella imagery.