and you are expected to post photos of at least the finished build, and WIP is also nice.
the work in progress pictures can get you positive feedback on how your build is gong, or what you might want to change, not to mention the inspiration seeing some of the other work going on.
some current examples are the HUNTERS Group build, any scale, but it needs to be specifically a tank hunter/killer like an M10 tank destroyer Or the Winter GB. this is more a cross over, the main thing is that it is in a winter camo paint, it can roll or fly.
A wild one right now includes planes and armor with badges for several different Countries depending on your model. I am working on a Spitfire in US markings, a M3 Honey tank for the British badge and a Bf 109 for the German.
Group badges are those things you see in many of the posts at the bottom. Some builds allow immediate use, others you must complete and post before you claim the badge.