From my limited experience profiling scanners, I've found the targets used to build a scanner profile work only for scanning the media (i.e. Kodak, Agfa film or print) they're made from. Scanning real objects like paintings are best left to using the scanner's software and then tweaking in Photoshop or other "by eye" methods.
Most paint pigment used to represent colors in nature as in the subject matter of your paintings fall well within a monitor's space so whatever the scanner can capture in 48bit RAW=(No color adjust), you could assign your monitor space or others like Colormatch and convert to AdobeRGB or ProPhotoRGB and edit in Photoshop which will give you far better previews for fast zooming and tools for tweaking over any scanner software.
I've done this with negatives (since there are no profile targets for this media type) and have gotten very good results just using Auto Color and setting B/W points in PS on my Epson 4870 flatbed 48bit RAW neg scans in two clicks. You'll find experimenting with assigning and converting various matrix based profiles like Colormatch, AdobeRGB, ProPhotoRGB will give you different shadow roll off and hue/saturation characteristics that might get you close to the original subject with very little tweaking. See Attachment.
Or you could assign the canned profile and see what happens. I've heard Don Hutcheson of Hutchcolor has created a very comprehensive scanner profiling target that may work with all types of image capture but it's a bit expensive. Do a web search to find out. [attachment=715:attachment]
