Hey Molly - get some more structural elements in there - think about how the central column might link to the outside ring etc - i think you need a bit more architecture in there... Ultimately, you'll be pushing the camera into this environment, I'm guessing - so it's important to create occlusion (i.e. overlapping elements to help create an experience of depth etc. Obviously, these views are helping you feel more confident about perspective, but I just don't think you've got enough structural interest or 'stuff' in this scene yet. I know you've got the book as a guide, but it's just that - a guide. I don't think your cave can just be an empty space - it might help you to look at cave reference again to help you think about the space more creatively (and thereby create more composition interest).http://blogs.telegraph.co.uk/culture/files/2010/08/bahamascaves1.jpghttp://farm4.static.flickr.com/3614/3494166004_d92659a997_o.jpghttp://www.weborithm.com/wp-content/2009/07/cathedral-cave.jpghttp://slices-of-life.com/wp-content/uploads/2011/09/cave-diving-1.jpghttp://mysteries24.com/files/lib/500x350/underwater_cave.jpg (look at the accent colour in this one!)http://i.telegraph.co.uk/multimedia/archive/01694/brazil-cave_1694091i.jpghttp://www.britannica.com/blogs/wp-content/uploads/2011/01/caves2.jpghttp://4.bp.blogspot.com/_xEehooYC6Rk/TNuAhdnxA6I/AAAAAAAAC38/eXvVv1-73WY/s1600/blue-hole-skiles-521184-xl.jpghttp://www.newman.pvt.k12.ia.us/highschool/technology/wihlm/colecanth/cave.jpgAnyway - you get the gist - and remember all that Phil Hosking taught you about digital painting - whacking in foreground, midground and background elements, and then using the erase tool to finesse them etc.I feel rather as if I'm bombarding you with different ways into this, and I might be being unhelpful now - but I do think you need to start dealing with the cave as a more architectural space in addition to working out the cauldron area etc.Anyway - I'm just revving you up really - be bold Molly. Be (Molly) bolder!