First Impression: Well, its been said in enough comments so won't go on too much about the challenge description that was sadly overlooked misread. As a shot its clean and simple yet quite a compelling scene, I think it would have done quite a bit better in a free study or correctly themed challenge.
Composition: Excellent composition with the basalt sitting nicely in the rule of thirds. The mix of sky and grassland adds to the overall size of the tower.
Subject: Great subject, I've just come back from holiday and a trip to the Staffa, the basalt Island in the inner hebredes - not a patch on this shot.
Technical: Spot on technically though maybe a little more detail in the woodland would help a little? My monitor is well calibrated but just a touch dark.
Final thoughts: I really like the overall scene and colours, its a great landscape and different from the norm here (thats a good thing btw). Yup, I need to finish on the fact that its a dnmc from me. Feel free to pm me if you want any clarification Tom.
What an amazing basalt formation! Where is this? New Zealand? Nicely balanced shot with strong colours. Looks like a dinosaur is about to appear any second....
Great pic, but I don't understand how it meets the challenge description. Lots of stuff in this challenge that does not. Maybe it's me that's missing something...