Christ was fully divine and fully human with all human temptations, and prayed for strength against those temptations, thus modeling the behavior we should exhibit in the same situations. The picture shows Christ praying when encountering a situation that many men would find to be a sexual temptation. His conduct in the scene is irreproachable and sinless.
Insofar as the picture of Christ is used to create ridicule or is designed entirely out of contempt toward God and His law of chastity, then it would indeed be blasphemous, but I personally don't see it that way. Perhaps I'm being too charitable or naive.
However, that image being used to score some sort of point is real sacrilege and, to your point, a good reason to stay away from Twitter.
See post #6. It isn’t Jesus, it’s Medieval philosopher Abelard. Also, see the monk’s robe and knotted cord? Why would Jesus wear that?
See post #6