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both suffer from a lack of correct perspective and no clear direction for the light in the scene. The first one the reflections have no connection to what they are reflecting that's a perspective problem and the second one all of the architectural elements lack correct perspective.
Well practice perspective until you know all the basic rules, especially as they apply to buildings and reflections. Work from life more to build a visual library so when you do work digitally or from photos you know how things should look. try to practice by isolating elements so its not so much to do at one time. Paint 100 skies from life or 100 buildings. Look at lots of paintings and try and figure out whats going on in them. Maybe do a couple of studies of professional work and see if you can mimic what they do as accurately as possible.