Designersaurs - student project

I randomly decided to do an icon set based around dinosaurs. I plan on doing a whole range of different species, but for now I thought I'd try a triceratops first because I feel it would be the most challenging. I’ve got three different variations and I’m not sure what direction I want to take them in.

Any feedback or advice would be greatly appreciated.

Designersaurs - image 1 - student project

I've had some free time, so I've added two more....T-rex is coming next

Designersaurs - image 2 - student project 

Designersaurs - image 3 - student project