I'm sorry if i am offending you, but thumbs on hands usually go inward. If your memory is so bad, you don't even remember how your own hands are shaped, i suggest you should go get some help. On the other hand though (HAHA, pun..) the thumb is facing the right way, so if the OC does not have two right hands, you need alittlebit more practice on anatomy. Good day.
you don't need a teacher to tell you which way the hand is supposed to be when drawing something. Just look at your own hand while doing it and point it at you. And be sure to look at the correct hand while drawing it. Just a friendly tip.