Moschino Pack help

The single-picture frames from the Moschino stuff pack are digital frames. Click on the frame and Manage Photo Inventory. That opens an inventory panel for the frame. Drag the photos you want to the frame's inventory. The frame will rotate through the pictures if there are more than one. Normally it changes pictures once per hour, but you can also choose 3, 6, 12, or 24 hours.

I don't think there's any way to pose a toddler or large group of sims, but you should be able to get pictures of them with Take Picture.