1st Image: Its over all very good. I suppose it would have been better if you had placed any element such as a boat / human in the composition so that it gives a sense of scale to the main structure.
2nd Image: As someone else has already suggested the man with helmet could have been elimintaed. Secondly the framing has been very tight due to which the cart's wheel and handle have been chopped off. It would have been better if they were fully included.