Use of levels and curves would really make this composition would add an extra punch and make it pop even more. The beautiful red rocks are incredible, you can almost feel the sharp edges on them.Helps to frame your subject very well.
Tahe viewers eyes is lead through the cave toward the other end effectively with the use of the contrast of the interior of the cave and the light coming from the other end.
Composition: Subject Placement, Cropping, Background 9
Technical: Focus, Exposure, Lighting, Processing 7
Appeal: Is it Interesting, Motivating, Etc.? 5
How well does it meet the challenge: 5
Total Averaged Rating 7 Autool
A great illustration of the proportion. The image needs some work though. It feels muddy and flat. You might try using levels. I'm confident you can get it to look much better. It's still one of the best in the group for showing proportion.