Whats up bro! All is looking good so far! Before questions can be answered, we would need more info.. Like what medium are you growing in? Coco, soil, soiless, a mix of coco and soil? It all makes a differnce. If you are using coco and havent fed nutes, its most likely not nute burn your dealing with.. It would be more along the lines of a nutrient deficiency. The leaves pointing upwards is normal ( from what I can see in the pics ) its called "praying".. Its a sign that the plants are in their sweet spot. Which is a good thing. I didnt see any leaf "curling" per say.. Just praying leaves.