Going way out on a limb here, trying to use the Enchanted Item rules (bending them here and there without breaking I hope): Here is my attempt at the Tattoist stats, and my attempt at creating the Dragon Tattoo.
The Tattooist-mancer (35 skill points)
Aspects: Ink Is Mightier Than The Sword
Superb: Discipline
Great: Conviction, Lore, Performance (Tattoo)
Good: Endurance, Resources, Scholarship
Fair: Contacts, Presence, Rapport
Average : Alertness, Athletics, Craftsmanship
Ritual[-2] p181 Focus Item, 2 Enchanted Items
Refinement[-1] p182 Crafting Specialization +1 Frequency, +1 Strength
Refinement[-1] p182 4 Enchanted Items
Physical: OOOO
Mental: OOO
Enchanted Item Dragon Tattoo:
Starting strength is 4 (from Lore), crafting specialization strength adds 1, using 3 enchanted items to raise the strength 3 more, giving a total of 8 strength.
Frequency base is 1, crafting specialization frequency adds 1, 3 enchanted items adding 2 uses per session for each gives 6 more, for a total of 8 uses.
Using the strength of 8, the dragon will get Breath Weapon (cost of 2), Claws (cost of 1), Wings (cost of 1), leaving 4 strength to attack with.
So, using the 4 strength as essentially a Fists score, with Claws Weapon:2, and the Breath Weapon as Thrown Weapon:2 with Weapon score of 4.
Bending the rules here, the 8 uses would give the dragon 8 attacks, alternating between claws and breath, until target is dead, 8 attacks are used up, or Tattooist tells it a different target. The dragon flows back onto the Tattooists body, looking strangely flat and not as lifelike as before, until it can be recharged per my previous post.
I am not sure if this is an acceptable interpretation, because I have several uses for tattoos in my game and so I would like to arrive at something that makes sense to most everyone. I do know that the PCs will eventually want to have something like this if they can, hence trying to find something reasonable. Thanks.