There's definitely some talent there
The stuff I could mention as 'flaws' are actually all about taste.
I don't really like stuff *just* chopped off. Like your brothers mouth (I would have stopped beneath his nose) or the Dogs left ear. I also think the lighting on your brother is probably a bit harsh. There is some hotspots on the left side of your broters face and the right side has some dark spots that really are just black.
But I love the use of light itself and the depth in the images is enormous. It's actually very nice