That looks kind of cool, it's almost like the tentacles are swirls of smoke or something. I assume you're going the Demon/Lord route? You could probably get a lot more detail in your concepts if you didn't use a brush that has so much blurry/fuzziness to it, and with a low opacity (around 25-35). I used a blurred brush in the first Unearthly Challenge and it really held back my concept. Hope this helps.
WIP: Will fix and draw the other leg and arm tomorrow.
EDIT: after a second look, I decided to change the structure of the leg, I will add more curve and an extra limb.
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I agree I bet the view from under that thing is NOT a pretty picture...
It's a cool idea, I say try to develop it futher
Keep going looks good.
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EDIT: after a second look, I decided to change the structure of the leg, I will add more curve and an extra limb.