What I do when I am like that is to read usenet or LJ for a bit and see how it flows. Then I put on a magic writing necklace(1), light a magic writing candle, rearrange my magic writing stones, and put a magic writing record on the record player. I open up Protext (the magic writing word-processor) and say to myself that I will sit there in front of it until the end of the side of the record. Then I write the first word. I'll look at the first word for a while, and hope that it leads me to the second and the third and so on. If I am in the precise state you describe, with the quote and the photo and the title, I'll copy out the quotes and the title and write the first word. If I don't have the slightest clue about the first word, but everything is in flow-state and not flowing, I'll write any word that is in the same space. (This works better for poems, where you don't have to start with the words in the right order.) If I have something like that one word and I focus on it, usually it shows me the way on.

The worst that happens is that I sit in front of a blank screen for half an hour listening to Bach.

It's rare for it not to work. If it doesn't work, I don't try to write again that day, I tell myself I'm not going to, and I do something else, usually something physical and useful like cooking or cleaning or making something out of lego. (Which isn't useful, per se, but is good for my hands.) Often then, in the middle of washing dishes or fitting together lego bricks, I'll start hearing the words and I'll be back at the computer jiggling with impatience for the two seconds it takes for Protext to load.

(1) Magic writing necklaces are available from elisem. Their magicality, and the magicality of the other items mentioned, which can be purchased from good quality stores everywhere, is entirely internal to the state of the writer, but heck, writing is also an internal and magical state, going from no words to words the way it does.