Similarly to what Caeli just said, usually ((I've noticed)) there's a little picture of a flower on one of the settings... that's for "close up." It might just be on the cameras I've used but generally that's what it is... On my camera there's a "scn" button, not sure what it stands for, but when I click to that setting I get to choose from "landscape" or "portrait" or "closeup" etc. and you choose the flower icon, it'll allow you to take pictures from... I think... 10-22 inches away?
You could try to raise the resolution on your camera, also. My camera takes pictures at 480dpi meaning they are HUGE, and I can scale them down as I feel necessary. This allows me to capture a TON of detail and then make it a little smaller to my preference.
Finally, I would use natural light. I'm an artist and last summer I made my own portfolio site - I had to take pictures of about 50 huge works of art. I laid them down on the floor in my living room right next to a window. Around 5:00 the light is always BLARING through that window, but it made for EXCELLENT pictures. This
is a photo of a painting of fabric that I did using that method, with no photo manipulation at ALL.
If you choose to use the natural light don't worry about it being too bright. You'll THINK it's too bright, but really the camera should straighten out the lighting itself. It looks like it's going to make your work look "glowing" but it's actually better that way since the camera makes things a little bit darker always.