She goes mostly by just Ayumi so it's hard to find a lot of stuff on her and it doesn't help that she doesn't really have all that much released at the moment. A few Idol Videos and a couple Idol photobooks is all it seems. You can find both her Idol Videos on Jappydolls One is called Summer Jewel while the other one is Eternal Summer so both summer themed videos. In her videos it looks like she really likes to dance around a lot which is nice. I can't find links to her Idol photobooks at the moment though but you can find a few of her pictures on Scanlover forum. You can read (well if you can read Japanese) more about her on her own blog here -- Ayumi's Secret. I also found another link for her from JapanSugoi that gives a little more info on her like her measurements and some other appearances that she's made since she started in the idol business back in 2005.
Check out that skimpy little black outfit (starts at 0:40 seconds in) and those sexy glasses.
