Thats a good sandy effect WildBat. Using some slight variations in saturation over the surface could also help create the feeling that the surface color is obscured a bit.
And to tommytone... YES now Serval has refreshed my mind on this PSP plugin issue! Try using the DLL files Serval has suggested (in the other thread where you posted) from our "Tools" page. They are what I think has helped other PSP users in the past with plugin troubles.
Thanks to Serval for pointing that out!