In model, I create a small cut (.001") to represent silkscreen location & size (typically rectangle, refer to jpeg shape). This cut will aid in placing basic location and size dimensional requirements in drawing. In the drawing, attach jpeg(s) of art work. Size and place accordingly over cut (acad does this extremely well). Reference jpeg image(s) to corresponding silk-screen part number(s).
Most silk-screeners have no real need for a rendered model. They typically want a "postscript" type file. The drawing just helps with quoting and basic inspection.
The inability to locate images & text accruately in drawings is a major complaint of mine.