Need help with a decal. Anyone good with photoshop?

So I've got a buddy with a vinyl cutter and I am trying to make out a decal for the 5's back window but I'm having some issues. I got the image and photoshoped it on my phone a bit but it's a little choppy on the roof part and the tail light part where I messed with it.

Can anyone fix those two issues? My buddy says the cutter is picky so the image must be clear and straight lines or the cutter will not cut it correctly.

If anyone could help, that would be greatly appreciated! Thanks!
 

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