That digger one (#4) is pretty cool, others are okay but nothing special. Some have an exceptional amount of noise (sky in #1, water in #2) which takes away form the overall look. You might want to try and fix that if possible.
is #4 a life size version of Wall-E? hahaha! Number 3 is a sweet handrail but these shots really aren't doing it for me either. Maybe try singling one thing out kind of like in #3? There is just too much going on in most of the photos. Use an artistic mind