Starry Night !
For a two dimensional artwork consider Vincent van Gogh's "Starry Night" with it's swirling patterns ,vibrant colors and expressive brush work.
David !
For a three dimensional artwork consider a sculpture like Michelangelo's "David " you could discuss its proportions, the use of marbel and how it engages the viewer's space .
Subjective reactions !
The dynamic movement in "Starry Night " gives me a sense of energy.
The scale of "David" is awe inspiring.
