Kayla's chest looks kinda misshapen and the perspective on the girls seems incongruous.Other than that,it's pretty good and you seem to be better with color than anything.Work on your shapes,and try to add a little more detail to your pictures.I'm sure they'd look great if you took a bit more time to add little details,like the sweat on Janeane.Apply those subtle touches to things like the beach towels and the back ground and you can only do well.Oh,and more texture on things like the sand would help a lot.All in all,work on detail,texture and shape and keep up the good work with your color and lines. :)