graphic question: shit from colors to other colors

[a]

Hallo,

look at this picture:
Loading Image...

The gay in the picture had violet hair behind his ears
(about 9000 shades of violet are used)

I need to change the violet to "white and grey"
because it is more natural.

I had a try on the left side, and it is... ugly!

QUESTION:
How could it be done?

I use paint shop pro 6 (and i have also installed paint shop pro 8, but
i'm not too familiar with it)

thanks

[a]

in the title:

shiFt