First I just want to say that I really enjoy this resource! It's very interesting.
I would love a longer timer, and I would also enjoy a couple more categories to draw from. Perhaps drapery/folds, and maybe a plants category with sub categories for trees, flowers, garden plants, etc? Like not just landscapes but an actual potted plant, close up of a tree, etc. For the rest I basically want more variety, I'm getting to the point where I'm seeing the same faces/bodies over and over. Also the still life objects are kind of limiited so I could use more of those. Perhaps a sub category could be glass? That can be pretty tough to render.
Not really complaining though. By the way I love being able to sort for facial expression so please keep that!