Iron Giant Pulverize animation change

[Heisho]

Greetings everyone. I'm making (or trying) some changes on the last animation of the Iron Giant.
Instead of using a drill, it will be like a cannon, I'm no sprite artist tough, but still I'm learning and wanted some feedback.
Thanks in advance. Also I added some new palettes, the sample is for something like a boss or the like. Still is a work in progress.