Without wanting to seem argumentative, I would quibble with
human heads as this limits our options of interpretation.
They could be divine or supernatural; they could be figurative or they could even represent actual people. If we blandly say "human" we are excluding many of these options.
There is also the question of the form of the heads, which is no doubt important. They are well drawn from the mouth up, but ballon-like in form below the chin.
I would suggest a two part statement, something like:
- The roots of the plant in You are not allowed to view links.
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Login to view. include depictions of two humanoid heads drawn realistically from the mouth-up but tapering away under the chin.
- In both cases, their hair is connected to the root structure of the plant and they are orientated to look towards the central root.
Or, if we want to keep it simple, just substitute "humanoid" for "human".