Hi Peter,
I really hate doing this c&c thing because it so subjective and I try and see good in most things......BUT...in your case, and because you asked.......
....I'll do no different (not in the nature).
No 1: I absolutely love because I can relate to the whole scene, not only can I see it, thanks to your picture, but I can feel it, smell it and hear it from having been there. But others will see it entirely differently based on their life experiences.
No 2: I found busy, but I appreciate your attempt to capture the available light. But again, what the folk at Pentax are looking for will only be known to them.
No 3: I like it, but it doesn't stand out for some reason, which I can't put my finger on....light a bit 'flat' perhaps. I will sit here and stare at a bit longer to see if anything hits me.
I would hazard a guess the hosts of that site are looking for things that make the shot standout and thus influence some one to go buy a Pentax. The question to you therefore, is, would you buy a Pentax on the strength of your 3 photos.
Cheers.....mate
Grant