I'd be interested in the article that you refer to in your post, Suzie. I only review children's books and haven't come across any young people who blog on the same topic. It is always interesting to get children to choose their own books as they are often not what we would choose!
Picture books are in a league of their own, I agree. There are many little nuances to a picture book - limited words, number of pages and the old adage, 'show don't tell'.
The publishing companies that I review for, I approached originally, but I'd like to support some of the smaller companies in helping them get the word out as well.