Pen, you are my friend...

This was my first attempt at drawing with a pen. It was a picture of two friends from years ago who were a couple. I wanted to challenge myself by seeing if could sketch without using an eraser or a smudging technique.
The photo of the two guys were laying on the beach sleeping. I thought this would be a good picture to test using pen because there wasn't that much shading involved due to the sun being directly on them.The photo is now lost, otherwise I would post it with this sketch.
Ink with 8.5X11 paper