Eagle is a great PCB designing software. But if you need to do some fancy graphics like specially shaped outline you will get stuck. Why not leave drawing tasks for other programs that are designed for. In this helpful tutorial you will learn how to draw complex shapes with Illustrator and then import it to Eagle.
Tutorial explains how to add anchor to lines so Eagle wouldn’t approximate curves with straight lines. The other process is easy – Export image to DXF R13 on Illustrator and then import to Eagle by using modified ULP script.