Opinions for first attempt at designing and sketching? (17 years old)

At present 17 years outdated seeking to main in structure and full medical conditions for med faculty afterwards. First drawing is of the Victory Column in Berlin and the previous couple of are of my very own design for a bridge column. I shadowed a pupil on the College of Miami and confirmed these drawings to him and a few of his friends. All have been very impressed. What are your ideas? (Final picture is for context of the primary two photos)