51B aft fuselage looks way too much like a herring butt. Thank goodness the bubble canopies allowed the aft fuselage to be slimmed out with the 51D.
The Spit wings are hideously huge. Las and Yaks have ugly stubby wings, and Typhoon/Tempy chins are uglyness supreme.
The grumman "Cats" are like a fat barrel, and the Jug looks like a jug. The hog is not bad, but it is ugly blue.
..
190As aren't that bad, but the nose is a bit too short. The 109E is pretty good, but too square.
Basically, the winner to having good looks, is definately the 109G-10/K-4 and the Fw190D-9/-12

The different cowl shape gives the G-10/K-4 a sinister look, and the wing size is right, fuselage slender and nice, and good looking tail, too. The radials on the 190D almost made it look bad, but the overall proportion of the plane is in lovely condition .

ps) in that sense, the P-40B is pretty good, too. The P-38 is not bad also.. but them 38's are like the Siamese twins of the aeronautical world.
Edit:
ps2) woops, the 190D don't have no radials! Thank god!