I can feel the sinister, creepy malevolence in this pic. The eyes alone are brimming with psionic malignant evil. The tentacles and the overall thin, sinewy figure of the illithid just speak of Lovecraftian horror. Perhaps Cthulhu is the grandfather of this depraved race.
Mm, yes, and this reminds me of a game I tricked my poor fool of a friend into playing. Escaping enslavement to the Illithids is one thing. Escaping the room where the great brain is? That's an entirely different story
Woo! Those things can get pretty bad-ass! And in the book I am currently reading(The Legend of Drizzit book one Homeland by R.A. Salvatore) Only the most powerful Drow family's have Illithids as their servants, and even then it's very few.
I love mind flayers (hence my profile picture - a clip of Jeff Easley's AD&D Adventures in Space painting).
I'm a big fan of Spelljammer, where the illithids actually had a space empire and flew around wildspace looking for places where they could land and kidnap slaves. I'm gong to submit your picture to the Spelljammer group on dA as I think they will love this picture too.