I'm a big fan of showing evocative imagery to the players for locations or creatures. In order to do this now, I need to create a handout, which means uploading the image and renaming it from "Mysterious Note", saving that, then hitting "Show to players". And this presents it to them in a frame with Roll20 chrome around it, and squished down. What I'd prefer is something closer to right clicking on a library item, clicking "Show to players" and have it come up in the full screen mode with the transparent black overlay behind it. I think this is much quicker and becomes more evocative of setting or creatures by obscuring background stuff.