Mikey invited you to go with him to a flower garden. He thought you'd like it, that's why he invited you. You went, and you were chatting with Mikey for a while, when he noticed your smile, and he grinned.

"Keep that smiley face. It looks good on you." He commented, smiling. He meant it, he thought your smile looked good on you, and he had no shame of admitting it.