I have been using the morning light that comes through my east facing window as a means of tracing my drawings onto the watercolour sheet. A simple A1 size sheet of perspex is supported high enough to allow the bright morning light to be reflected off a sheet of white paper. I also lower the blinds and turn off any internal lights that may be a nuisance. This arrangement gives a bigger drafting surface for transfering the final drawing onto the Arches 300gsm hot-press paper. I dont think this will work at all with 640gsm paper- unfortunately.
