Thanks for the comment if that in successor activity I consider it
The shape is good, the outline might work better if it wasn't black, you could use shades of grey and helo the guns be more visible. Check this for ref on shading/coloring;
http://t3.gstatic.com/images?q=tbn:Z3ffOHFR7yYnOM:http://img143.imageshack.us/img143/7654/indent1.png&t=1
Here is a page of info you might find useful;
http://forum.toribash.com/showthread.php?t=125361
Well here, has a little corrected