Thanks everyone for quick reply!
I finally got it..
Basically, I switched to AF mode: zone, readjusted focus area to the biggest size from settings, then backed my camera up as much as i could in order to fit the area in focus, made a shot and cropped the image in photoshop. F16, iso100, shutter speed was on auto and 1/8. Tripod. No post processing done yet. I can tell that the picture is not that sharp, but I am satisfied with the result. Probably if my light set up was little more powerful i could get better images.
I am definitely switching to miniature sculptures)))