"steven" can refer to a number of copyrights, artists, characters, and other things. Check the current list of steven* tags to see if there is a more specific one that fits what you are trying to tag.

Some of the more popular tags from that list include...

Copyrights

• steven_universe

Artists

• steven_stagg
• stevenlew
• steven_ciervyena
• steven_huang
• steven_purifoy
• steven_belledin
• stevencarson
• steven3031

Characters

• steven_quartz_universe
• steven_magnet_(mlp)
• steven_stone
• steven_(drstiesel)
• steven_stinkman
• steven_(timberwolfmax)
• steven_(kagesorex)
• steven_armstrong

...but check the complete list if the one you want isn't listed here.