Hi and welcome, #photography is a tag for the Photostreem tribe and as always been one of the more well received tags in Steemit, there is the #monomad challenge for monocromatic tones (black and white), in the Neoxian tribe you can find the #neoxianphotochallenge, there is the #photofeed curation space and also #photocircle.
Enjoy and steem on !