User-Uploaded Content

There are many Steam features that support custom image and content uploads for players. Examples include screenshots, player artwork, custom profiles, and workshop items.

When uploading images or workshop content, you should adhere to the following guidelines:
Don’t upload inappropriate content. Examples include:
Real or disturbing depictions of violence;
Content that exploits children in any way; and
Sexually explicit content. This does not forbid game content posted in its own game hub.

Don't bypass Steam's Mature Content Preferences
Don't upload content that you don't have the rights to
Don't upload images of other people without their permission
Don't use content to harass, abuse, or otherwise disparage others
Don’t advertise commercial content
Make sure the content you post matches the space where it is posted. Example: Don’t upload Dota artwork to the Counter-Strike hub.