Perhaps an in-person visit would help. Although so many of the higher-end galleries do not accept unsolicited submissions, you might be able to charm someone into looking at your work. Connections and sometimes portfolio reviews work, too. Many artists and photographers send updates of their current work to a curated mailing list of galleries and collectors. Instagram works for some.
Today most galleries, like publishers, want someone with an established record and/or easily marketable images. Or Blue Chip. Small art galleries go out of business faster than restaurants, and they don't really take many risks. They don't pay anything for the work (it is really on consignment), some will charge for framing and marketing expenses, maybe even costs associated with openings if you're not a major player. Or simply deduct some of those expenses from the sale--if there are any.