Try not to use natural light for your artwork. Direct sunlight can really damage the art, the UV rays will fade your prints and can be very harmful to paintings. Try to keep your artwork away from bright windows.
When lighting your artwork, considered the colour temperature in your space. If your piece is cool toned, I suggest using white LED lights, but if your artwork is warmer colours (reds, browns, etc.) go for a yellow bulb.
If you have more than one piece, track lights are an easy lighting solution. You can simply screw them into your ceiling and angle them towards your pieces. Try to keep the angle of the light somewhere around 30 degrees out from the wall to minimize the reflection in the glass of your artwork.
If you really want to bring the focus onto one larger print, I would recommend using a picture light. These are really easy to instal in the wall, or can clip right to the frame. These are a classic option even used often in art galleries to light artwork.
Depending on the frame, the light on the artwork can be greatly affected. The frame can cast a shadow depending on the size as well as the frame can bounce colour onto a piece. If you’re using a more dramatic and thick frame, I recommend installing a picture light above the piece to make sure no strong shadows are being cast onto the artwork.