Just thought you might want to see what I've done. It's now AI-free - hooray! I took your drawing, turned it into vectors in Inkscape and then tweaked parts (except the notch in the ear, which was perfect), before adding the blur outline and text in Gimp. It's all been a very useful learning experience for me - especially using Inkscape, which seems to be a seriously impressive bit of software. Of course the good thing about having it as vectors is that it means it's easy to tweak details.