Hello Dopple,
Great Job so far.
I'm late but i have to say that the perspective of the palace exterior worries me :/ you made the part next to the water, the one with the dragon look lke the floor of the palace. (in my opinion)

Right now on this cave for adding more variety whyn ot adding pieces of diferent crystals to the wall? (rubies, diamonds,etc) so you can keep the same repited tile of the stones but you can distract the person opinion of "copy paste" but adding the diamonds
Great job again.