Hey, mate!
Solid cleanliness you've got here! Honestly, your lines are very crisp, and the coloring is all very well-done. About the only thing I'd say you really need to sit around and work on is your anatomy and technical skills. Your cartoonish style is absolutely perfect, though it could use a bit more guidance in the drawing department. For instance, the barrel of the rifle is a bit wonky, and could use some more depth and building, specifically. Same with the rest of the rifle. Otherwise, very solid! Keep up the good work, mate!
-Cullen V. Mathews-Bentley (Sottaceti)