We did our photos about a month ago, so it's too late for me... I've been engaged about 6 months now, so my ring's been worn a lot. But it was still super sparkly and I couldn't see any dirt or anything, so I just wore it like every day for engagement photos. Which is great, and they turned out awesome, even the close-ups.
However...
I just had my ring cleaned (one of my micro-pave stones fell out, and the jeweler was awesome enough to repair for free, and cleaned and re-dipped while they had my ring) and it is just glittering! I forgot it was this sparkly!!! Just like the first week we were engaged, I can't keep my eyes off of it!
So ladies, before you have your e-shots, do yourself a favor - have the jeweler who your FI bought the ring from clean it, or pay another jeweler to clean it (it isn't very expensive, if they charge you anything at all - just go to look at wedding bands, and casually ask if they'll clean your ring. They probably will for free). It is SO worth it! Sparkly shiny pretty glittery things!