Yeahhh, it was never meant to be anything so complex or difficult to figure out; he was just trying to have fun with us. Besides, if you look at all the hints he gave us, it really should have been extremely easy for everyone to figure out. XD
Let's see, first he said "the Moi-meme-Moitie site was renewed the other day" -- ok so the picture is probably hidden in a new item listed on the front page.
He said its an EGL photo, so look in the EGL pictures!!
He also said its a picture from a recent photo shoot he did in EGL and EGA. Well whats the most recent shoot hes done in Moitie? Gothic & Lolita Ensemble.
Now lets put it together -- Recent update and Recent GLE photo where hes wearing EGL. Well there were only two dresses he wore in his most recent photo shoot and theres only one EGL dress posted in the most recent update on the front page...Also, its even more obvious for those who can read Japanese because there happens to only be ONE EGL dress on the front page (which he wore in the GLE) and its the only one that says オススメ or "Recommended" on it. XD
Sorry if I sound like I'm calling any of you our or anything -- thats not my intent. I just find it amazing how many people can't seem to find the photo because they seem to be making it harder on themselves than it really is (and I guess looking for a different kind of photo). If you just step back for a moment and listen to the things Mana has to say, its rather apparent!
Either way, it was just meant to be a fun game for those who wanted to see a new Mana picture...