You can also consider an alternative approach: implement http ("web server") on top of tcp/ip/ppp stack on the microcontroller, so the picture is displayed in a web browser as a content of a web page; or implement a vnc server.
While implementing these protocols on a microcontroller is not a trivial task (but can be done, as numerous examples on the web prove it); it has the advantags of zero programming on PC, and (first of all) is platform independent. And as a bonus, "nice" features can be easily added.

Jan Waclawek