I'm not super picky on how you lay this one out. Just make sure that panel 3 gets the space it deserves.
1 – Clint walks off in another, bigger huff. Bruce and Natasha keep talking.
HAWKEYE (1) (in background): rassum frassum.
HAWKEYE (2) (in background): No hammer. No shield. Might as well say no fun.
BRUCE: Are you sure you won't reconsider, Natasha?
BLACK WIDOW: I'm sure. I appreciate everything you've said, but I still need time to prove to myself that I'm worthy.
2 – Natasha puts her hand on Bruce's shoulder in reassurance. She is confident in her words.
BLACK WIDOW: I know that things look bad, but with your strength, my skill, and Clint's... unique talents, I know we'll be fine.
HAWKEYE (off-panel): Hey guys!
3 – Switch to Clint. He's wearing a suit of Iron Armour. The helmet is not on, enabling everyone to see the huge grin of excitement he's wearing on his face.
HAWKEYE: Whaddya think?
4 – Close-up of Natasha's mouth. She smiles knowingly.
BLACK WIDOW: I think it's time to Assemble.