help spriting a pixel perfect force feild sprite

can someone help me sprite a force field sprite?
its for a mod to a game called starbound which is a sandbox platformer.
I would like to have animation where it has a scan line rising up from the bottom refreshing the shield.
however I am bad at drawing 3d objects

I have tried attempting to sprite it starting from top and scanning to bottom but I can't even do half of this.
here is what I have done so far

http://imgur.com/yHuy6Q5