It's funny how sometimes an object can dictate how, and what you will use, to draw it. For example, this perfume bottle was never going to look like this. I was never going to use pencil and ballpoint. I don't believe I have ever used pencil with ballpoint in a picture before. It had never occurred to me to put them together. But the combination of the metal and glass of this perfume bottle just seemed to cry out for these two mediums. I'm still not even sure that it works but I just did what I was told.
(Just a thought; I do have a set of drawings on Flickr that are just ballpoint and pencil and I think they look pretty good together - as a set. Take a look by clicking here.)