That is seriously good for a first attempt... hell, mine don't look that good and I've been doing it for ages!
I can't add any new tips, but definitely agree with all the ones above, slow and steady, take note of the fall of the needle... left, right, left, right, left... so you know where to stop it.... and don't be afraid to do only one or two stitches before stopping and turning a little, one or two more, stop and turn a little again.