Both of these paintings are by the artist Keith Weesner. He is a current artist who specializes in hot rod and pinup style paintings.
This painting implies motion by using the jet trails behind the 'space ship'. The trails not only show motion, but additionally show the path that she took in order to get where she is pictured, centered in the frame. The trails get smaller on the way back to behind the building showing that a distance has been traveled and that she has come closer to the frame than where she originally began. The spaceship/ car she has is also canted at an angle as she continues to go around a turn. This banking angle implies that she is going at enough of a speed that her car is tilted as the result of it's momentum.
This painting essentially has eight different moving object each moving independently in the frame. Centered in the painting is the flag-girl leaping from the ground. The small distance between where her foot ends and her shadow begins implies that she is off of the ground and basic rules of gravity imply the movement involved in doing so. At the front of the image is a roadster sliding out around a turn. Though his car is in focus, his wheels are tires are somewhat blurred which makes it looks as though they are spinning. Behind each tire is dirt and gravel being kicked up in the air from his movement. Finally, the back of his car is kicked out at an angle and his front tires are turned in to compensate around the turn. This implies that the car is traveling at a high enough rate of speed that he would slide out around the turn. The cars behind him each have their own clouds of smoke and dust showing that they are maintaining speed with the main focus of the painting.
