In #1, moving to the left would have been better, putting the gap in the mountains towards the right side and showing more of the dock, boats, etc. Good exposure and color.
#2 is way underexposed. Sometimes very dark images can seem mysterious, but here you can barely see that there is someone on the sidewalk.
#3 is nice - good use of bw tonal differences. The seated figure and the stuff on the left are a little far apart, so maybe shooting from a different angle would have been even better. Cropping a little of the uniform gray sky at the top might be helpful also.
#4 is tough to look at just in terms of subject matter. Cropping on the bottom to remove the bright strip probably is a good idea.