Renaissance vs. Today
During the renaissance, the first proportional human drawing was done by Leonardo Da Vinci, in 1490. Da Vinci, who would sketch out dead bodies during the night, to create all of his proportional human body parts.
From Da Vinci's Vitruvian Man, it really showed up in many of Da Vinci's Mona Lisa and many other artists work. The Mona Lisa is one of Da Vinci's most famous pieces, and it shows his work of the proportional human.
The statue David, by Michelangelo demonstrates the human body in great detail. Michelangelo thought of himself more into sculpting than painting, and it shows greatly. The detail of all the human features, such as the skin texture, the muscle build, and the connection to human like features. It is a sculpture of beauty that captures the realism of a human, from the renaissance.
Today, you may see many drawings, paintings, sculptures and many more pieces of artwork, that is properly proportional. Many drawings you see, like the one above, you can the high detail, in the eyes, the skin, the details in the clothing, and the proportional human body. Without Da Vinci's Vitruvian Man, and many other pieces of art, we wouldn't have this kind of art. It may still be unproportional. The renaissance gave us the right measurements, and right placement of the human body parts to produce human realistic artwork.