Not too bad for your first, but it was rather short.
Tip: Next time, try to use slightly thicker lines on your animated characters and such.
Especially the very outline on your characters should be a little thicker than the normal lines.
It makes everything look much better.
Also if you're going with a completely black outline, make the black clothing or hair slightly brighter.
Not exactly gray, but a slightly brighter shade of black.
Of course it's up to you if you want to use my tips or not, but I'm throwing this out there so that you know that you have several options. Keep doing this and try to improve, and you'll see that you'll get better.
Once again, not bad for your first.