Toman, you didn't specify what the age group is for the youths. For children, I think it's a bit too sterile, and I wonder if the people silhouettes aren't too abstract for them. Every bookstore (or area) I've seen that caters to children is filled with colors and cartoon images. I think the concept might appeal to teenagers, however. I do think your falling into a trap, though, that a lot of designers do in that your ignoring point-of-sale - retailers are going to put up displays for sales, new merchandise, etc. If you ignore that during design, you might not be to pleased with the end result.