When you edit your post there should be a section for map screenshots. Put any screenshots you have of your map here. Be sure to take the screenshot in fullscreen with cl_drawhud 0 in the console and to tick off 'draw viewmodels' in the options>multiplayer>advanced menu. Take the screenshots with source or just print the screen. Also, try and make them as aesthetically pleasing and informative as possible, the former being the least important.