knowing the character level would help.
color spray is a good solid spell at low levels.
the thing with tattooed sorceror is you need to pick what school you want for the tattoo, which boosts Caster Level for that school.
that can affect damage dice (evocation), but also duration or other things.
lots of buffs are transmutation if he wants to go there, duration boosts are never bad...
he doesn't need to worry about the bloodline spells' school, as they are all get their CL boosted regardless,
you you just want to decide based on the spells NOT granted by the bloodline, what school do you want a CL boost for.
the bloodline arcana is nice for summoning, although i'm not sure if that's really the biggest priority until you get some more spell levels at 4th and 6th class level. if you choose conjuration for the tattoo, that helps out on duration of summons though. if/when he's interested in summoning, spell focus:conj, augment summons, and later superior summons can definitely be good.
once he's higher level, improved familiar may be a good feat to get, it has several angel/celestial options.
early on, toughness is always helpful, the +2 fort/will/reflex feats, improved init are all good.