This is the most difficult but thank goodness I am not the artist haha. I have to meticulously check if the storyboard and actual drawing is what I wanted and approve it. At this point, there is minimum changes.
There are many style of drawing. So it is best to find an artist whom you like the style and let him draw in what he does best. I am glad I found and artist whose style is what I like.
I like something that is clean and simple. Reason is simple, its for parents and kids.