first plant? looks great how long have you had it in flower???? it looks a lil bit wet but that dosnt matter
looks good how long in flower 3wks? & did you foliar feed & if so careful to not burn the plant w/ droplets combined w/ the light. when foliar feeding do it 1st thing when lights come on or couple hrs b/4 lights off, if useing hid lighting that is.
yellow tips mean ur overwatering or overnuteing or both just my humble opinion my advice is to let it dry out alittle and then flush with 10% nute solution then adjust them with an ec meter u want about 1.4 to 2.0 ec for flowering and 6.5 to 7.0 PH flush last week good luck