First step into close-up photography

I tried today captured close -up/macro images that represent factual, texture, abstract, form and metaphor. All photos has been taken at the college.

 F/4, ISO 400, Exposure time 1/250, macro lens, artificial light

 F/3.5, ISO 400, Exposure time 1/120, macro lens, artificial light

F/5, ISO 200, Exposure time 1/50, normal kit lens, day light