1. Think: are they cute? 2. If yes: swipe right/check other photos or description/message, if no: do the opposite.
Id do pretty much the same as I'd do with my own race. In both cases, religion is more important. If they pay a lot of attention to a belief other than my own (Im an atheist), it's kind of a turn-off.
Im also more attracted to one race than to the other. I prefer Asian or caucasian guys over hispanic or African and I don't like light blonde hair on guys. For girls it's different, I don't have much of a racial preference with them.