Light VS. Dark

A friend of mine recently told me that my art was too "dark" and that there was always some hidden undertone to it. I understand why she said that, but I do not see this in all of my drawings.

As I´m trying to slowly find a job (at least a side job) where I can also be creative and hopefully do some drawings and illustrations, I would like to know whether you prefer the "dark" and moody pictures or the other lighter and more colorful ones. Take the poll on the right side of the navigation bar. Thanks!