Composite Piece - The Identity of the Environment

For my composite piece I am going to have it set in a park, so there will be people jogging, biking, and walking throughout. The identity of the environment will be somewhat serious and realistic. I want the environment to look sunny and nice so I will really focus on where to put the lights and darks. The environment will be energetic and busy, so I want to have a lot going on to make it look really active.