Upon seeing the frown on the merman's face as he gave him back the necklace, he wondered for a second what could have gone through his mind. He knew they still lacked a way to communicate, so he sighed and wrapped the necklace around his neck again, looking down at the shells as they decorated his chest. Though when he thought about it, it was certainly a weird coincidence. Same kinds of shells, some material to keep them together as necklace. Surely his mother didn't steal it from merfolk, did she? Definitely not. It was probably abandoned on the beach or something. 

He hoped. 

Silently, he turned around, crossing his legs as he watched the other attempt to strike up a conversation between them again. He awaited his ideas, and it was right under his nose. Shiro drew on the sand, and Keith wasted no time to lean forward and lay on his stomach, raising his legs up in the air. He rested his chin in his palm, grinning as he saw the tiny merman smile at what looked like a squid. Soon the human's lips parted and he chuckled. Cute. And smart. Almost human smart, if not even smarter.

Mirroring him, Keith drew a stick figure of himself, complete with a shirt and shorts. His hair was the hardest to draw, but eventually he got there, and drew the closest he could to it. Then, with stars as eyes and a happy grin as his mouth, he drew a triangle covered in circles. Unsure whether the merman understood the written word, he wrote it anyway. 'Pizza'. Then he drew shells, fish, showing his favorite things in the world. Before he continued over to his dislikes, he looked up at the merman. See what he understood or didn't understand.