Well, you couldn't have chosen a harder subject; children! Their facial porportions are not the same as an adult's, and then haveing it holding a horse's ear; man, that's hard. Is this your daughter? Anyway, if you enjoy drawing, and I think you did rather well, dont' give up after one try. That photo has a lot of nice feeling in it and that is always nice when turning it into a drawing, but it's also exceedingly difficult for a first try. Work you way up to humans and children, start with just horse heads.