Is it normal that the leafs are heading down?

Heya! It'll straighten out once it grows a bit, you can help it along by putting a humidity dome over it. Just take any clear plastic dome or even the bottom half of a soda bottle and put it over the plant after you water it. It'll keep the humidity under that thing in the 80's even though it's only 50% in your tent. 50% RH is fine for your whole grow btw, don't worry to much about it with the humidifier and all that, that's for if you get down into the 30's during the rest of your grow. I also saw you hooked up your carbon filter, you don't need to do that this early either. These things won't start noticeably smelling until well into their 2nd week of flower (trust your nose though). It feels like you aren't doing enough on your first grow even though you might be doing too much! Try to relax and let the plant be a plant for a bit!