My original tumblr post was here. This image appears to be one of Dejah Thoris by Frank Cho (b. 1971), who has a website here. It was first posted on tumblr by Lost in the Pine Barrens and comes to us via reginaldjuice.
Tumblr favorite #2369: Dejah Thoris carried off
I think one of the most ignored bit of canon in the SF art world is that Dejah Thoris is naked in ERB’s stories.