i think ive come a cross with somewhat a solution after a week of experimenting. ive tried first copying an image and desaturating it and performed a adjustments on its levels to bring some contrast. then i tried to use the cutout filter with a 8,2,2 setting (max number of levels, 2 on edge simplcity and 2 on fidelity). then copying that image and adding some gaussian blurr into it. then use the cutout filter with (6,4,2) setting this would make the edges round. ill then add some mask on the last layer and erase the super simplified areas specially in the face. after that. ill copy the original image and perform a cutout filter on it. ill combine the desturated images (images which was performed with cutout filter) and use some blending modes usually i prefer a lighten or dodged, depends on your liking. the fine lines would then be created by using a glowing edges filter on the desaturated image and put it on top of your layers stack. and use some blending modes usually lighten or dodge.
anyway..... though my tips sound confusing (im planning to create a detailed tute on this so you could see the result, sorry for the long confusing tip

). the end result is a lightened version of the design chapel's model or design. maybe they tried vectoring, but i can still see that there are some areas in the pictures (at the rest of the site in the downloads sections or their wallpapers) that wasnt vectored. they might have used some filter techniques.
ey... if anyone of you out there could figure their technique i would be very grateful and most appreciative. it would greatly help me since im now shifting from modular and grunge type designs to the recent trend of pop art designs "popping" (that's so redudantly lame) in the net right now.
so again thanks guys for commenting.
keep designing and breaking boundaries!