I didn't know about April Gornik until I started working at a museum that had a large drawing of hers that quickly became one of my favorite works. I don't know how she captured this moment of light - one that I recognize and remember - in a drawing (http://contentdm.unl.edu/cdm/singleitem/collection/sheldon/id/428/rec/1) but she did it.

I don't think he's really an unknown, but I love Enrique Chagoya.

two works (http://thefuturelab.org/tag/chagoya/)
Part of one of his codexes (http://publications.newberry.org/aztecs/s5i6.html)