Hello, I'm diving into the portraiture world! I just need some help on what I should purchase as I'm on a limited budget. I have a 7d2. Shoot through umbrella 100mm 2.8 YN 568 speedlites I'm curious what else should I get for the capabilities of head shots/portraits Thinking of the 50 1.4 A soft box not sure of the size though? Maybe the westcott 28x28? Flash meter (eventually) Please help!!