Flesh

Flesh includes the Vishul's mouth, pawpads, horns, spikes and even the tiny scales under the eye. These can be various different colors including pink and orange hues, even blue chow! One should remember that the flesh colors should not be overly saturated or unnatural color, such as neon green. If you want to play it safe, you can always check the stock image below and pick a safe color from the allowed color palette. You can also use it as a guideline when picking flesh colors!
When it comes to spikes or horns, they are allowed to be different colors as long as the coloring doesn't appear unnatural. For example, being 5 different colors all around.
Always remember to look at your design from outsider's eyes too! Like, would it look natural to have every other spike white and yellow? Or to have multiple different colors on horns?
We say no.

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Eyes

Vishul's eyes can be various different colors! There are multiple good choices to have allowed eye color. Basic rules are that the pupil must be present and remain black in color. So therefore if the eyes were colored black, we wouldn't be able to see the pupil as its own part fo the eye. Dark grey would be allowed! There are also a few stock eyes ready in the import bases from where you can choose freely.

There is an item called Eye Alteration that allows the removal of the pupil, recoloring the pupil, adding slight shine to the eye. You can acquire one from the cosmetics Shoppe or even by crafting if you're lucky!

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For now the Vishul's general expression like glaze, eyebrows, mouth CANNOT be altered to differ from the import lines. You could always add some wrinkles/fat if you're making visual changes to Vishul's weight. Anything else expression wise is currently unavailable.