It’s an ART120 research; 2D Design  Research paintings, drawings, and artists and find one artwork to use as a sample for each vocabulary word listed below:  

Unity
Emphasis and Focal Point
Scale and Proportion
Balance
Rhythm
Line
Shape
Pattern and Texture
Illusion of Space
Linear Perspective
Atmospheric Perspective
Illusion of Motion
Value
Primary colors
Secondary colors
Tertiary colors
Complementary colors
Analogous colors
Warm and Cool colors
Optical color

You can Google: famous paintings in museums and this will get you into a database of museums that have their painting collection on-line of Google: famous artworks in Art History.
Here is a list of artist that may be successful searches: Matisse, Mondrian, Picasso, Kandinsky, Leger, Miro, Franz Marc, August Macke, Van Gogh, Chevreul, Goethe, Nolde, Manet, Monet, da Vinci, Vuillard, Seurat, Delacroix, or you can use some samples in Architecture   Directions: 

Each vocabulary will have its own page where you’ll type the word, place the jpg of the representative art work.
Include the artist’s name, title of the work (in italics), medium (oil on canvas, etc), size, year created, and the URL address and/or the museum where the work is located.
Tell me, in your own words, why you chose this work. I will include a sample attached; ignore the definition part as I have my definitions already, and do not use “I like the painting…” (no opinions)