Hi Panzeriv,
The instructions for the KP kit show a disruptive pattern upper surface in sand and dark brown (Humbrol colours 63 and 113 given). Underside is light blue (Humbrol 65 quoted). Fin tip is emerald green (Humbrol 19).
National markings carried in all 6 locations with an Iraqi flag on either side of the fin and a Bort number in arabic on both sides of the forward fuselage just below the cockpit.
There is a picture of an Iraqi Su-25 here:
http://www.aeronautics.ru/sukhoi/su25115.jpg
Hope this is of use,
Rob M.