Wow! Thats awesome! The only point I have on this is that at the tail there are too many points. Change the points to 'make selected nodes symmetric.' ou can do that by clicking on the point you want to change then selecting that option at the top of the screen.
Strangely, I don't use Photoshop to make any of my art (I do, however, plan on learning how to use it soon though). For all my art and vectors, I use Gimp.
Well for me, it was all trial and error. I have never once looked at a tutorial or read up on something unless I really needed it. I used guerilla learning tactics to get where I am at the moment, but I guess I could try my hand at making a tutorial at how I do vectors in Gimp