Where are the last 3 Hearts?!?!?!?!?

I'm sure (100%) that i miss 3 Heartcontainers.... i spend a lot of time and i cut every single gras.... i also found the hidden LAMA Statue -> BUT it looks like i miss "3" Heartcontainer! Where could they be? Is there someting i am missing....?

i wish i could help you but i dont think ive even beaten the game 100% yet

Thank you Audiokillers! With only one memory it's just hard to decide between speedrun and 100% run.... But since there is no hint for the last 3 hearts, I don't know if I can invest much more time here.