1 and 2 will probably make sense to some. It's not something that would overcome my why not.
For 3 the biggest problem with encryption is you introduce a single point of failure, if you lose access to the keys your photos are gone.
On a simpler note I'm a big fan of keeping things as simple as I can. Encryption is not simple. It can be fun to work with and I don't want to ignore that but unless you want to do that for fun I don't think it's worth the complexity.