Completing the first basic perspective instructions I attempted to paint something on my own, using a perspective grid which I created myself and it went amazingly well. I used no reference, kept everything in grayscale, loose and sketchy. I'm going to continue studying the next chapter of the perspective sketching and I'll be sending Matt Kohr a huge thank you email for his greatness. I mean I studied other books before but never have I seen something so practical. I can really use everything he taught me, and use it well.
I highly recommend everyone visits his website and CTRLpaint.com. He creates many many helpful videos and is really doing something great for everyone to enjoy.