Just looking at the EXIF, I can tell that it is not from a Pentax camera as I am so accustom to it by now. I am not good at giving critiques but I did learn some neat tips from a good friend of mine who taught photo-critique class in our community few years ago. The first thing I learned from him was to first ask myself this question:
what do I like/dislike about the photo and why? Only then he would offer his opinion and comments either agree or disagree. Another point he made which I still remember well is that:
don't over-analyse too much... just keep moving on, there will always be another (better) shot to explore and learn from.
I am not sure what to say here (as I think you have tried very hard) except that I feel that this shot appears to be missing something to anchor/draw my interest when I am looking at it. It is hard to say what is wrong (if there is any). It could be the color (I prefer Pentax color
), the lighting and contrast, the (lack of) details, the (lack of) sharpness, or simply a lack of (an interesting) subject. This type of photos without attention grabber can easily slipped into the bottom of the pile without being noticed, as my friend would say without too much comment.
OTOH, if your intent is to improve this photo, then, I think you have already some pretty good advice from other posters.