These ratings are from the Season 1 Skin Wars marathon, which aired on Sunday, April 10th (All Times ET):
1:00pm Skin Wars (episode 2): 235,000 total viewers/52,000 18-49 viewers
2:00pm Skin Wars (episode 3): 243,000 total viewers/64,000 18-49 viewers
3:00pm Skin Wars (episode 4): 251,000 total viewers/63,000 18-49 viewers
4:00pm Skin Wars (episode 5): 271,000 total viewers/56,000 18-49 viewers
Overall: Poor in total viewers (though not completely awful for a Sunday afternoon in the Spring and a marathon of a show that does not do well in reruns). Also younger-skewing than most of the GSN lineup but not as young skewing as Skin Wars normally performs.