"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!
Contrast of colour, clever imagery Jason Munn poster. This poster uses contrasting colors for the paint brush and paint can to form a musical note against the green background, and the paint stick leads the viewer's eyes to the music artist's name below.