The best in my opinion would be to start your own tag. For example, under the science there are numerous posts and not all are high quality and some are even copy pasted etc. Bottom, bad quality.
Then came the SteemSTEM team and they created their own tag with their own regulations that users must follow to use the steemstem tag. And now if we want to read some quality science post we just have to visit the steemstem tag and it's almost guaranteed you'll come across great articles.
So you can do something similar too. Come up with minimum or basic quality requirements of the pictures that can be uploaded under your new tag and soon if people wanna see some quality snapshots, they can visit the tag.
Just a suggestion, how about #steemsnaps as the tag? xD xD
P.S. : Just added myself to your fanbase on steemauto!!