This is a piece from Illustrator Rose Wong's show called 'Consider Death' in Brooklyn. I love how beautiful this piece is in its minimal use of line and color, and the distorted sense of scale that it gives you.
"Vertical Landscape" by Eiko Ojala. It looks like a paper landscape but the artist actually works digitally and hand-draws all the elements to look like they're cut out of people. (Hint: the shadows help!
This painting shows proportion by showing the height difference between the lady and the trees.