The Spiff up section has a couple interesting tools you can use to help create a better drawing.

Conveyor Decal

You can insert an image onto the side of a conveyor using this tool. Left click on the tool, then left click on a conveyor to place the decal.  After inserting, double-clicking onto the image will open the file explorer allowing you to select your desired image.

Flow Arrow

The Flow Arrow is an indication of the direction the MTBH flows.  Left click on the tool, then left click anywhere along the conveyor line to place the flow arrow.  There are may customizable options for the flow arrows within the quick properties box.