Hi

Here you may find an explaination for this :
http://seamframework.org/Documentation/HowToUploadAndDownloadFilesInSeam

Beside if your image obey to a defined url pattern then you may need a servlet that have the seam context available

http://docs.jboss.com/seam/2.1.0.CR1/reference/en-US/html/configuration.html#d0e22804

And it may be worth to study the souce code of the org.jboss.seam.servlet.SeamResourceServlet resouces servlet as well.

Good luck.