>>5889137>I used a Canson 300g sheet and the paint really behaves very differently on itYes, paper can definitely influence how the paint's behave. If you have a bit of money and want to try le real paper, try to get a sheet 50x60 cm2 or so of Arches 300gsm (100% cotton paper; either a hot-pressed: smooth surface, or a cold-pressed: slightly textured).
>how do you know what classifies as tea, coffee, milk and such and how much ink to useI can but assume you're using cakes/pans, which is basically dried paint. Try to sprinkle the pans with water and let sit for 20min or so: the water will redissolve the top of the cakes to a paste, as if it was coming out of a tube.
If that paste is dry enough to stand to on itself, you basically have something with the consistency of butter.
If it's not thick as this, but still something that won't run easily when put it on the palette and tilt it, that's cream.
Slightly less thick and more runny, you have milk.
Coffee and tea are relatively similar: tea is really a washed out, light mixture, coffee is a bit stronger but still very watery.
>Does the paint have to feel like those things?So yes
>I also wet the paper first, which led to the painting going out of the pencil lines.You can try to look to the paper at angle to see where the is water and where there isn't, this should
help you get a bit more precise.