It's not bad start, I guess. There are a lot of things I would try to work on.
The body proportions are a little weird. Torso is too long I think.
Some of the lines are very wobbly looking, especially in the thighs. This makes the body look kinda mangled or something.
The way the head and boobs are moving is kinda weird. It looks like you're sort of approximating the principle of
Overlapping Action, but the execution is a little off. I would maybe try to add some delay between each phase of movement. (I'm assuming this is getting ass-fucked or doggy styled)
Let me try it myself and see...