Need photorealistic high quality 3D pictures

Hi! I need 3D pictures for the 4 attached columbarium. The pictures should be very realistic and look like the monuments are made in granite (I supply granite texture pictures also). This is a total of 19 pictures because I will ask to change the color of some elements (for example doors made of a different type of granite) and some will have options for 1, 2 or 3 layers ("floors"). But all are based on these 4 basic shapes (see attachements). Time frame for doing it is a week. Please include in your bid samples of your previous work. Any need for clarification please ask!