Pictures of leaf curl

Looks fine to me. I've had several seedlings that weren't quite symetric. Judging by the color and texture things look ok. As long as the deformed part is still healthy it'll be ok. Plain dirt? I hope it's good dirt. Most regular dirt from the ground is compact and will retain water too long for your roots. If you can't get your hands on good dirt, make sure you break it up and add something to aerate it (like small rocks or perlite).