Cover of A Storm Of Swords
It shows a dwarf man walking out of a castle. I think the man is Tyrion, it may indicate
Tyrion's escape from prison after he was condemned to death on false charge of murdering Joffrey
It could also symbolically indicate that now Tyrion is free of his loyalty to his family
Tyrion loved his brother Jaime Lannister. But by the end of A Storm Of Swords, he comes to know that all the members of his immediate family members betrayed him. Tywin Lannister had Tyrion's wife Tysha raped. Jaime Lannister supported (out of obedience or fear) Tywin, in this deed and his sister Cersei Lannister wants him dead. Finally Tyrion knows it all and he has given up on his family.
The cover might indicate one or both of these two things.
Cover of A Feast For Crows
The cover shows three people walking through wilderness and another person following them. Three people ahead could be Dick Crabb (in front, he was their guide), Brienne of Tarth (with the shield), Podrick Payne (at back). The fourth person following them could be Ser Hyle Hunt. It could indicate their journey to Crackclaw Point.
Brienne had received a shield from Jaime Lannister
Ser Illifer crooked a bony finger at her shield. Though its paint was cracked and peeling, the device it bore showed plain: a black bat on a field divided bendwise, silver and gold. “You bear a liar’s shield, to which you have no right. My grandfather’s grandfather helped kill the last o’ Lothston. None since has dared to show that bat, black as the deeds of them that bore it.”
The shield was the one Ser Jaime had taken from the armory at Harrenhal. Brienne had found it in the stables with her mare, along with much else; saddle and bridle, chain mail hauberk and visored greathelm, purses of gold and silver and a parchment more valuable than either. “I lost mine own shield,” she explained.
Podrick Payne had joined up with Brienne thinking Tyrion Lannister and Sansa Stark had escaped togther.
The horse reared, and the skinny boy went flying, his cloak flapping like a pair of wings. He landed in the mud and came up with dirt and dead brown grass between his teeth to find Brienne standing over him. It was the same boy, beyond a doubt. She recognized the sty. “Who are you?” she demanded.
The boy’s mouth worked soundlessly. His eyes were big as eggs. “Puh,” was all he could manage. “Puh.” His chain mail byrnie made a rattling sound when he shivered. “Puh. Puh.”
“Please?” said Brienne. “Are you saying please?” She laid the point of her sword on the apple of his throat. “Please tell me who you are, and why you’re following me.”
“Not puh-puh-please.” He stuck a finger in his mouth, and flicked away a clump of mud, spitting. “Puh-puh-Pod. My name. Puh-puh-Podrick. Puh-Payne.”
Dick Crabb agrees to guide Brienne and Podrick Payne in their journey to Crackclaw Point.
“Ten dragons are a fortune. Do you take me for a fool?”
“No, but I can take you to one.” The coin danced one way, and back the other. “Take you to the Whispers, m’lady.”
Brienne did not like the way his fingers played with that gold coin. Still . . . “Six dragons if we find my sister. Two if we only find the fool. Nothing if nothing is what we find.”
Crabb shrugged. “Six is good. Six will serve.”
Ser Hyle Hunt secretly follows Brienne through Crackclaw Point and catches up with her at the Whispers. I say this because the fourth person is dressed up in steel and is way behind the rest.
“Why did you do that, my lady? Ser?” asked Pod.
“It was the reward I promised him for finding me the fool.”
Laughter sounded from behind them. She ripped Oathkeeper from her sheath and whirled, expecting more Bloody Mummers . . . but it was only Hyle Hunt atop the crumbling wall, his legs crossed. “If there are brothels down in hell, the wretch will thank you,” the knight called down. “Elsewise, that’s a waste of good gold.”
“I keep my promises. What are you doing here?”
“Lord Randyll bid me follow you. If by some freak’s chance you stumbled onto Sansa Stark, he told me to bring her back to Maidenpool. Have no fear, I was commanded not to harm you.”