What's in the Sack?

Today was drop everything and draw (DEAD) day. We drew a picture with charcoal of objects in a trash bag.
The goal was to draw it quickly at the beginning and add details at the ending. The difficulty of the project was to draw the clear trash bags. The trick was to draw the object inside the bag first and then use the eraser to make white lines that looks like the reflection of light on the bags. It worked pretty well for me. I focused on the texture and the shading of the objects and the sack itself. I was happy with the results of my work.