Benjamin drew this when he was 4.5 old.
It was his first ever recognizable drawing. Before that his drawings were all very chaotic scribbles. He did his best drawings with a variety of colors, and each color represented a different animal or event. One of my favorites looked like a mess to most people but to him it was a whale spouting a rainbow. (think a big purple blob on a blue and white background with scribbles of all colors. Now at six he can draw elaborate machines (think Dr Seuss style inventions), and landscapes, all with recognizable shapes.
Boys actually tend to see the world in movement and so their pictures tend to be more chaotic looking for longer. It is best to praise the energy and the movement in the picture. Express how you love the motion he creates. DS was really sensitive too and always asked me to draw for him, especially because his pre-school teachers would give him low marks for coloring outside the lines, struggling with geometric shapes, and choosing the "wrong" color. I had a talk with them about age appropriate expectations for boys and helped them find ways to encourage his artistic talents. So far, so good.
His 16 mo sister is already able to hold a pen like an adult and draw some recognizable shapes. I think girls have notably better fine motor skills at younger ages, but that with time these even out. DS is now (age 6) one of the best artists in his class.