They need a plastic pot with drain holes and a fast draining potting mix. When watering give them a good soak as spraying is useless.

tj

I'd just add that a "bonsai seed kit" is not going to be a very a satisfactory introduction to bonsai. 😕 A conifer grown from seed - like your pine - will take years before it is ready to undergo bonsai training. And just to be clear, 'bonsai' is not a specific type of plant - any plant can be bonsai'd - but a growing/training method that is conducted over a extended period of time. Many bonsais are decades old....some more than a 100 years old.

Right now they look like they need to be watered. Soon. Misting isn't enough. Peat pots are a PITA -- switch to plastic pots and a good quality potting mix.