1.) Your design is way too simple, which may still work if you had perfect typography and spacing, which you don’t, they are both very poor.
2.) Try to use more interesting images, those you’ve used look way too random, they lack any mutual style or topic
3.) You can’t be more unoriginal than to add “Developed with by author” on your page. It is 2016, this was cool maybe two years ago.
4.) Your item name “Creativefolio” - adding “creative” to your item name doesn’t make it creative, quite opposite to be honest
- and 4. are obviously not reasons for rejection, they are just my personal opinions, but 1. is definitely a reason for hard rejection
You will get more detailed review once you pass certain quality threshold. It is not realistic to expect a detailed review for each item considering the amount of submissions (and already long review times). Also, it is not reviewers job to teach you basics of design anyway. Your designs shows that you obviously lack those basics - typography, whitespace, attention to details and so on. Work on your skills and try again in time.