I might as well throw in my 2 cents.
The gate-source zener is a 20V device, which is pretty borderline. I'm not sure the gate-channel insulation would survive. I would replace it with a lower voltage device, say 10 or 12V.
The MOSFET has no protection against inrush current to C9 at start up. OK, there is a preregulator which will slow things down, but even so, I would add a 10R source resistor to limit the peak current to about 500mA which is within the SOA of the MOSFET.
As Nikolay mentions, an extra smoothing cap is a nice addition, though not essential. I wouldn't bother with an extra series resistor since the source resistance of the potential divider is already about 80k, which is plenty high.