I'd say that shape-wise, you're off to a good start so far.

Your material texturing probably needs to have some more --- differentiation.
In my mind's eye, I conceive of layers and strata and veins of different
minerals and sediments, and oxides, and benthic layers, etc.
The homogeneous red-rust-brown looks like someone sprayed it with pigment or
rusty water.   I had a shower supplied by a dug well that looked like that.   :O

as for real caves - browse around and see what _you_ think.
https://www.google.com/search?q=caves&rlz=1C1AFAA_enUS660US660&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwivuvDQqp3LAhX
C9h4KHZLNBRsQsAQIHA&biw=1366&bih=705

I have no doubt that you'll come up with something visually stunning, inspiring,
and something to learn from and aspire towards - as usual.  :)

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