I move all my project related picts to project dirs on my PC, and use a service called Tresorit to sync those dirs with my laptop and engineer's 'puter (she lives in a different country). If I ever need to view the pict again (or any project doc) on the iphone (which is almost never), I use the Tresorit app.

Most of these cloud sync services forces one to put their sync'd dir on the desktop, which I find annoying, any my clients tend toward long dir structures so I don't want to waste 30 odd characters on bla/bla/desktop/bla. Tresorit allows you to have your sync'd dirs anywhere.