Wow,lovely sketching there,top stuff
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I know what you mean,my scanner doesn't get the faint stuff also.one way you can fix this is if you have a digital camera ,take a photo of it making sure that the camera is 90* to the sketch(this is what i did with my leo triplet sketch as the detail was too faint for the scanner).You will most likely have colour cast and so what you do,is in gimp right click on the pic and go down to the mode tab and it will come up with RGB or grayscale click grayscale and then invert it and viola it should be pretty good.hope this is of some help.
Despite your problem it is still a lovely sketch
Regards orestis
