Typically, your standard nymph tears' deck is this:
Hover over cards for details, click for permalink
5i4 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5io 5io 5io 5io 5io 5io 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5jm 8pp
This is because the best nymph to get from your nymph's tears is actually a water nymph. This is because if your primary water nymph dies, you still have your combo, you can get two nymphs out a turn with 8 water quanta, and your entire deck generates water quanta so you can get nymphs out easily.
Now, I know what you're thinking. That's boring. Horribly boring!
And you're right. Fortunately, you get to add other nymphs into your deck by adding a cavalcade of pillars. My favourite addition is Entropy for Discord:
Hover over cards for details, click for permalink
4vl 4vl 4vl 50u 50u 50u 50u 50u 50u 50u 50u 5i4 5i4 5i4 5i4 5i4 5i4 5io 5io 5io 5io 5io 5io 5jm 5jm 5jm 5jm 5jm 5jm 5jm 8pp
Take note of how I'm only using pendulums as my off-colour. This is because NT is simply that important and I need them that much.
In the case of time:
Hover over cards for details, click for permalink
5ig 5ig 5ig 5i4 5i4 5i4 5i4 5i4 5i4 5i4 5ig 5ig 5ig 5jm 5jm 5jm 5jm 5jm 5jm 5jm 5se 5se 5se 5t2 5t2 5t2 5t2 5t2 5t2 5t2 8pp
(Use Eternities instead of SoR if you don't have them - SoR is more funny though)
So, why not random nymphs? Put short, they're massively unreliable. They require quantum pillars in order to be used effectively, which hurts your water nymph generation.
Now, it is worth noting that if you use nymph's tears on a mark, you actually get a random nymph - if you wanted to have fun, there's your option. Just upgrade water marks, have everyone cry in horror as you upgrade your precious marks that you don't have, and violla.