Buy or rent a true macro lens (EF 50mm f/2.5 Compact Macro would be ideal or the new EF-S 60mm f/2.8 USM Macro).
In addition to being corrected for close working distances (which you are shooting from) a macro lens is also corrected for a flat-field so the center and the corners of the field all come into focus at the same time. Not super important for photographing the real world, but critically important when photographing flat artwork like a painting.
Macro lenses are also highly corrected for linear-distortion (bending of straight lines) which is important to photographing rectangular artwork. No other lenses, particularly zooms will be so well corrected.
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