I would take out Nocturnus and replace with Bloodflow Connesseur because you are running the Bloodline Keeper you can just sacrifice the Keeper tokens make Bloodflow bigger and trigger Blood Artist all at the same time. Aristocrat is nice in a Blood Artist deck also. And for removal in a Blood Artist deck, i have learned Bone Splinter is amazing because essentially you are gaining two life and they are losing two to sacrifice one of your tokens to get rid of their bombs like Wolfir Silverheart or Titans. Also Blood Artist plus Killing Wave equals amazing results. Test it out sometime it is a fun deck so far :)
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Blood Artist is always good and if you are running the Bloodline Keeper, then I suggest Bloodflow Conesseur so you can sacrifice your Bloodline tokens, Bloodflow gets huge, you are gaining life and they are losing life for the Artist trigger, and then drop a Killing Wave for pure Blood Artist dominance against token decks and Ajani cats. Also the Aristocrat is nice, and a good spell is Bone Splinter combo with Blood Artist. You sacrifice a creature, then destroy target creature, so essentially you are gaining 2 life and they are losing 2 AND their Inferno Titan or Primordial Hydra or whatever bomb that isn't hexproof or indestructible out there. Plus Exquisite Blood for every time he loses life you gain life......endless possibilities my friend. Great starting point bro :)