It's better than most of the stuff I see on dA, so you're doing well. Keep practicing and you'll be really good.
A few pointers:
Those indentations in the leg (circled in red) look like they're meant to be where the knee is, but they're too high up. The legs should be a bit longer than the body and the knees should be half way down the legs.
The breasts look weird. You either need to add lines to show that they have 3D volume (green), or just make them protrude less sideways.
The diaper looks a bit too thin. This bit is personal preference, but I like them to have significant volume. I've added a rough paint-over in blue.
Oh, and next time you upload a photo taken with your phone it's a good idea to fix the rotation in a program like GIMP first. The phone adds metadata to the jpeg file indication the correct orientation, but some browsers don't understand that metadata and show the picture on its side. It's a very minor issue though.