Darkness and Light sketch

Hello there! Havn't uploaded anything in ... hmmm... I dunno. Anyway, been very long.

So, you may be wondering, what's with the title? Well, here's my explanation:

Today at school, I found that I still had a small piece of paper under my desk. Abd it would have been wasted if I didn't use it. So, I suddenly felt really artsy and drew this funny dragon.

Basically, It's supposed to be a dragon, with things/horn/spikes growing out of its body, representing darkness. The lines above the dragon represent darkness and fire, while those curvy ones below represent water and light.

Anyway, I'm planning to do it properly in PS after my exams. Because, seriously, it's really unclear when It's all pencil markings. Should I?