One more thought… how have you modelled the underside of the water droplets, where they’re touching the petals? If you’ve got a bottom surface on the droplets and a slight gap between the droplets and the petals you’ll get the wrong effect. Try moving the droplets so they go slightly through the surface of the petals and see how that looks. Of course, to do it properly, you’d need to create a separate material just for the interface between water and petal, but that’s probably overkill for now.

Yes, there is a little gap between waterdrop and petal. The problem is, the petal A&D material uses displace map to model some folds and stretches. So, in my 3ds viewport, all droplets are “fly” over the corresponding surfaceand it`s very difficult to move them precisely on the displaced surface! I`ve already spend lots of time moving them up and down :-( If waterdrop is too low, it becomes dark, if its too high it`s overshot :-(

Can you explain me, what a material you talking about, between water and surface?

The illustration to the post above.

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Can you explain me, what a material you talking about, between water and surface?

I think Rich is refering to the principles that are described in the A&D Material Tips and Tricks section of the Max help.
It’s in Material Editor, Materials and Maps > Types of Materials > mental ray Materials > Arch & Design Mateial (mental ray) >
There is a section on Water and Liquids, showing a glass of drink, and explains how to set it up for correct refractions.
Because the petal is not refractive, I would sugest making the droplet intersect the petal. You say this makes it too dark, that could be the water’s shadow on the petal, the water’s transparency colour, or lack of trace depth. To get accurate shading on the petal under the droplet, you may need Caustics.

Thanks Samab, that’s exactly what I meant.

PZ - the drops you’ve labelled as “dark” look pretty good to me. Is the water completely transparent?

Is the water completely transparent?

Set the transparency Colour to pure white, not the light blue seen in your original material setup. That should lighten the shadow on the petal under the droplet. A bit of AO on the petal will darken it at the edges of the droplet, giving some variation in shade under it without needing caustics.