Even it.

 

The best place to document artwork is on a cloudy day. This is when light is the evenest.

If you don't have a cloudy day, find a place that has the BEST most EVEN lighting conditions possible from every corner of your artwork.

EVEN the light out.

Mountain Lake Reflection
Abandoned TV

Find it. To light it.

 

Do it.

Things around your house that can help you light your artwork.

Lamp
Lamp
Hanging Brass Lamps
Light in the Sky
Red Flashlight
Solid Wooden Table
Camera Lights
Photoshop it.