Looks good, I'd only repeat the ear comments - usually good to work with a reference for ears and they can be annoying to model and sculpting them is no way to cheat the job either, embrace them and you'll get them right.
If it helps here's an ear I recently modelled:
I suppose it's difficult to explain, but I started with cicle of tris pointing towards on vertex, within that circle, I cut in a loop and started shaping the ear and repeating until the polygons picked up, the more detail bits, I cut polygons and deleted edges to get the flow and shaped the detail.
Of course, you're making me want Zbrush more now...well I'll have £800 to spend soon, so, it might be on my shopping list
"Experience never provides its judgments with true or strict universality; but only (through induction) with assumed and comparative universality." - Immanuel Kant