Matani

Thus far I've only done little work with veg tanned leather and no dyes, mainly using the mallet to pound stuff into the leather (I'm very much a beginner), but I saw this today and fell in love with the look. How exactly is this look accomplished? The edges look a lot crisper than what I'm used to getting, is that just the effects of the dye playing tricks on me, better knife control, etc? I'm making sure I don't have any illusions about what I'd need to do before I just go get some dyes.