We've received a lot of requests from users related to ability of adding description, so we've made it possible to optionally add it to your photo.
For content filtering we use json_metadata, not 'steepshot' tag. So if you create a post through steemit.com with 'steepshot' tag you won't see it on https://alpha.steepshot.io
Super! I was testing it already, and found out you do not use the tag itself.