RE: [Crowdsourced solutions] The problem with Tags...
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Truth be told - I don't think anything can be done. Especially because those tags are always at the top trending.
Currently - the only way would be for people to use their up-votes and down-votes to vote with their virtual wallets.
I feel your pain as it's very frustrating, mentally anguishing and hard to curate in the photography - new, category; as one has to sift through a lot of crud (to put it nice) to find gold.
It's much like browsing through the user sub in Imgur.com trying to find something halfway decent.
The only 2 options would be to somehow create a system of censorship (which goes against the spirit of Steemit) or (the best solution) have moderators like in Reddit.
If I can think of any better solutions - I'll be sure to reply to this post!