It looks really nice Duca. There's a couple things I'd do to make it 'better', if I may. File more of a chisel onto that left hand end of the copper so that you can direct a very small part of the hammer onto the flint. And when I heat the bit end, I heat it up so that about 1 1/2" of the shank gets red too, and quench. Then, repolish, and holding the heat 1 1//2" up from the end, watch the colours go down the shaft. take the heat away when the tip is straw/brown, and quench if you like, or just let it cool by itself. Looks to me like you got the tip a little too hot in the tempering stage. you can do it over starting at the hardening stage, as many times as you need to to get the right temper. Too soft, and the bit will bend. Too hard, and it will fracture.
