Which illustration technique uses downsampling? cropping anti-aliasing imperfection contrast

If your choices are:
cropping 
anti-aliasing
 imperfection\
 contrast

Downsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. This is the opposite of upsampling. So the answer is contrast.

the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.

the artist used rapid brushstrokes.