I know a few people who RP arcanima patterns as being something you can etch on a body (either via tattoo or scarification), on the basis that the magic also involves the geometry itself -- the ink alone is not sufficient, as the magical geometry is really the "invocation." So, I think your tattoo idea is definitely workable. 
Somewhat related but a bit off the topic, Arcanima's praxis reminds me a lot of Hermeticism and Western esoterica generally (especially sacred geometry, occult science, and the Order of the Golden Dawn), so you probably can't go wrong with a "feel" to your character's style that's similar. If you want a more RPG-ish reference, I'd take a look at the Solificati and Order of Hermes from Mage: the Ascension or House Verditus from Ars Magica as sources of inspiration.
Somewhat related but a bit off the topic, Arcanima's praxis reminds me a lot of Hermeticism and Western esoterica generally (especially sacred geometry, occult science, and the Order of the Golden Dawn), so you probably can't go wrong with a "feel" to your character's style that's similar. If you want a more RPG-ish reference, I'd take a look at the Solificati and Order of Hermes from Mage: the Ascension or House Verditus from Ars Magica as sources of inspiration.
The Freelance Wizard
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Quality RP at low, low prices!
((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))
