Philatelic Ostrich

Something a little bit different from what I'm more accustomed to painting: I illustrated this ostrich as part of a friend's ad campaign for their philately business. If, like me, philately is a word that you've not previously encountered, it's basically the name of the stamp collecting hobby, and my client chose this ostrich as bird stamps are apparently quite popular among collectors.
The style represents something of a change of pace for me too, so do let me know if any of you feel that there's any way that I could improve it. :)