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No, Mudokon heads sprayPainted on the walls have nothing to do with secret areas.
The only ways to indicate that a Secret area is near, is either empty SoulStorm Brew Bottles, or falling pebbles.
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Yes it does. The very first screen of a secret area always has a big yellow smiling mudokon head somewhere (hidden) in the background. And with that, once you enter the first screen of a secret area, you hear a litte jingle.
But that's only when you're already in the secret area, so indeed it doesn't indicate that a secret area is 'near'.