[viasta]

If you want to draw over your image in Photoshop... don't take a sharpie to the monitor for one thing.

In your layers palette there's a button at the corner that looks like a page with a bent corner. It's a New Layers button. Click that and you'll get a new transparent layer above your image. It's like a tracing paper... so you can draw on it but it won't affect your original image.

Then press B which is the brush tool, select what type of brush you want from the top and draw over it.

oooo...ty