devshots_screenshot produces a .tga file so that the quality does not go down like a jpeg. It takes a screenshot of everything that is on the screen, so you should use the camera first. The file is a few megabytes if you do use this console command.
There's also a guide on shadows by MaxofS2D
http://blog.maxofs2d.net/?page_id=419 (It says it's outdated, but there are some useful console commands on there.)
Finally, here is a picture.
