No Entrance hall mods are logged onto the .org at this moment, but i'll be sure to contact them once they are. As for uploading:

Make sure that the file is in either a .gif or .jpeg format and resize the image so it is no larger than 800x600. If you need a program to do these things then go here Infranview Infranview is a nice free and easy to use image editor.

After you have changed it's format and size, then go here; Story uploader, this is the file space for story screenshots. once uploaded here the Assistant moderator in charge of managing the screens (me) will transfer them to the filespace for you to use. Use your own username in it's title so you can find it easier, ie Krakra01.

after you have uploaded the screen look for it here:File space, the reason i told you to put your name in the file is so you can find it easy as there is a whole lot of screens in there.