Some characteristics include being more artificial, with exaggerated proportions, and distorted perspectives. Mannerism took influences from the high renaissance period.
Describe the lines, colors, values , shapes, textures, space and movement. Sorry if this is not what you meant but i hope this helped i. some way!
Light sources can be coming into any angle of the piece of work. it can make the contrast different completely, and make the piece darker or lighter.
