Moving CAD Drawing to Photoshop

Before moving a drawing from AutoCAD to Photoshop, get the size right through going to Page Setup

Change paper size

When it's what you want, export it as EPS from Plot

Go to photoshop

To fill an area we have to line it

Adding an arrow and distorting it:

you can add any effects to the drawing when it's on photoshop because it turns to a picture and anything will apply.