The composition is nice, although the clouds could have been a little more cooperative in their forms. The appliance at the center of the disc though is far too undefined. It is not defined by contrast with its surroundings or by color or by focus and the shadows confound its shape rather than helping to define. Obviously a difficult subject to photograph.
Composition: Subject Placement, Cropping, Background 6
Technical: Focus, Exposure, Lighting, Processing 5
Appeal: Is it Interesting, Motivating, Etc. 4
How well does it meet the challenge: 7
Total Averaged Rating(Rounded) 6
Composition: Subject Placement, Cropping, Background 6
Technical: Focus, Exposure, Lighting, Processing 8
Appeal: Is it Interesting, Motivating, Etc.? 5
How well does it meet the challenge: 8
Total Averaged Rating 6 Dick
I like the way you brought the sky into the picture and then capitalized on it with your title. Yes, it does look as if this is an ancient watchtower still looking for alien life to descend. ; > )