However, Fett remained alive, using his jetpack and weapons some while later, blasted himself out, becoming one of the only beings ever known to escape from a sarlacc's belly alive. While studying a holographic recording recovered from Fett's helmet camera, Senior Anthropologist Mammon Hoole discovered an unsettling revelation: the beast apparently possessed the ability to telepathically torture its prey. In this recording, Fett appeared to be reacting to stimuli that did not exist, suggesting that sarlacc were capable not only of communication, but apparently of malevolence, feeding off of the fears of their prisoners.
Direct quote from wookiepedia
I also read a comic where he escaped via the "poo" hole
Still nice painting and effect you realized. I like it!