My original tumblr post was here. The illustration contains the signature of Alex Schomburg. It is sourced to notpulpcovers, who labels it “Startling Stories / Illustration 4” and attributes it to Flickr.
Tumblr favorite #2027: Laughing mind controller
So, is the mind controller ordering the guy to do what he obviously wants to do?
I wish I knew! Unfortunately I haven’t yet been able to find the original context for this illustration.