VOLATILE WASTE CONTAINERS

I am currently working on this set of trash icons for my dock. I don't know if I like it yet, I will make the waste in different colors later. Honestly I wanted the radioactive waste to shoot up a lot higher when the trash is full but when I export the icon it is a lot smaller than it should be. I just started making my own icons recently so I would appreciate if anyone can tell me if there is something I am doing wrong here. I wasn't going to let anyone use them until I was done but since I want some feed back tell me what you think and what you would like to see, thanx...