Some more Photoshop practice, trying to get the height and depth right in the cave:
It's getting there. I'm still keeping the detail to a minimum so I can focus on getting the positioning right and I think I'm almost there. The stalactites are looking much taller and there's more going on as I added a couple more rows of them so that's pretty positive. One thing is that I haven't added any shading or light to the columns yet, but like I said previously, I just want to get the angle right first.
It needs work but I think this is a good sign! :)