"Granted should I also watch Brotherhood?" Oh, definitely. It rushes through a lot of the beginning since the original anime had already done a great job adapting that and covers the manga properly afterwards. There's other differences, as well, and since both are enjoyable, it's basically the "two cakes" meme.
It is rather interesting to see you drawing something like this. All your other uploads have had that goofy, cartoony, kid-friendly aspect and FMA is a little darker at times which I wasn't sure if you could properly convey. I like Al more than Ed here. He understands that this is art and should pose properly for it. Ed, meanwhile, is trying too hard to look cool (probably to distract viewers from noticing how... *mumble mumble* he is).