The first shot, which I think is the best of the set, is at ISO 2260 (ISO 800 set in camera, result was too dark, 1,5 stop added in Lightroom) so it's a bit grainy.
They were all shot using a flash bounced off a cardboard thingy. Lens is a Vivitar 100mm f/2.8 macro. Camera is K20D.
Click them for higher res or flickr page with exif info.
You may have even pushed exposure a little too far on a couple of these.
But they're all well done.
4 and 6 are great - and it's only the last image that the noise grain is noticeably apparent.