Want a tip?

Here is the tip. Look at your body. I have said this many times to other people, but it's something that is very simple and works. Use your own body as a guide to how it shoul look.
Now for a critique of he actual drawing:

The guys body is wrong in many ways. The left arm, if you stretch it it goes even below the knees. The right arm is.... Like, coming out of his chest. And the 51 should be more in his back. If he is facing sideways then only the 5 should be visible.
On the girl, the knees are non existent. The skirt doesnt show me the figure of her right leg, and her whole body is to rigid. If she is pulling on something, then make it look like she is really pulling on that Teddy.

Practice practice practice. And try to use your body as a guide like I said before ;)