Whoa, dude, how the ****? That looks amazing. I'd never think you had anything but a flat chest.
I was a complete and total failure at binding which is part of the reason I ended up planning for and subsequently getting top surgery before HRT. My chest, though huge to me, was only a C (I think?) and I still couldn't manage to get anywhere near that flat.
Color me impressed.
Regardless, I know binding sucks but it really does look great. I keep going back to look at the pictures and... yeah. Awesome job.