A - Junior, one headphones do not make a solid reference anchor for judging quality of sound. You can only COMPARE any other headphones to your good quality headphones, and make a RELATIVE assessments of sound. To do more than that you need more than one superior headphones, I'd say three of them. I would pick Beyerdynamic T1, Sennheiser HD800 and Stax, either SR009 or Omega II. With these headphones you can triangulate [average out from the three sound signatures] what an ideal headphones' sound is, at the current state of technology. Against this ideal you could attempt to make some absolute judgments on the sound of headphones which you are reviewing. Guys with a lot of audio experience, those who for years have listened to several high quality headphones do have, in their heads, some approximation of what a perfect headphones' sound signature is. At your age you need more than one pair of headphones to attempt to do the same.
B - You need reference audio tracks of various types of music.
C - Some, at least passive, musical training and basic knowledge of recorded music mixing and mastering.