Perspective view in grey tone (rollover for alternative)
Cost around £70
Isometric view in blue tone (rollover for alternative)
Cost around £60
Elevation view in black line and grey tone
Cost around £45
Linework illustrations with tints and tones of flat monochrome colour or greyscale added to give interest and form or to fulfil a design requirement.
This is a relatively simple process, on this image, and does not add much to the overal cost from the initial line work version.