Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven […] Now he was a sturdy straw-haired man of thirty, with a rather hard mouth and a supercilious manner. Two shining arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward. Not even the effeminate swank of his riding clothes could hide the enormous power of that body - he seemed to fill those glistening boots until he strained the top lacing, and you could see a great pack of muscle shifting when his shoulder moved under his thin coat. It was a body capable of enormous leverage – a cruel body. (The Great Gatsby)
She had once been a famous athlete, and even now the muscles were still clearly in evidence. You could see them in the bull-neck, in the big shoulders, in the thick arms, in the sinewy wrists and in the powerful legs. Looking at her, you got the feeling that this was someone who could bend iron bars and tear telephone directories in half. Her face, I’m afraid, was neither a thing of beauty nor a joy for ever. She had an obstinate chin, a cruel mouth and small arrogant eyes. And as for her clothes… they were, to say the least, extremely odd. She always had on a brown cotton smock which was pinched in around the waist with a wide leather belt. This belt was fastened in front with an enormous silver buckle. The massive thighs which emerged from out of the smock were encased in a pair of extraordinary breeches, bottle-green in colour and made of coarse twill. These breeches reached to just below the knees and from there on down she sported green stockings with turn-up tops, which displayed her calf-muscles to perfection. (Matilda)
Both writers are fond of slipping lines from Keats into their work too. But given that comparative studies of Fitzgerald and Dahl are so distressingly rare, what can one do with the insight?