Aloha and welcome to Steemit =)
You don't have to write little books for your blog, just write some words about the drawings you did or why you did sth and that is just fine. I think its sometimes good when there isn't a big text for some images because sometimes you just want to view some nice pictures and read a little bit about them and not the whole life story ;-)
So I wish you the best for achieving your goals =)