Personally, I think I'd add Schottkey clamp diodes from the microprocessor pin (ie, the junction of R9 and R10) to the Vcc and Gnd of the micro. These will prevent the micro pin from being driven outside its supplies by charge coupled through the drain-gate capacitance of the FET if there should be a sudden change of voltage on the drain. The high-side diode will also prevent the micro from seeing 12V if the FETs gate oxide should break down or become shorted for any other reason (like a liquid spillage) - with a diode in place, you should just burn out R9 and not kill the micro.
Probably overkill, but worth considdering - might save you some grief.