Zingtober: Wrackoo 'Rivals' Zingu

Hi guys, yesterday I got back from work very late but was still able to draw this. I was so tired and exhausted and couldn't edit or share it and I fell asleep. This morning was packed and I couldn't share it either so here am I during my lunch break sharing yesterday's prompt Rival.
I wanted to draw the Fire dragon but having drawn Glaciox the day before I opted for a Mutated Zingu and Wrackoo facing each other as rivals. The mountain that I tried depicting didn't eventually look the way I anticipated, I giess there's still more to learn.
In making this, I used different shades of colour; blue, purple, yellow, orange, brown, green and black.