Ars Magica CHARACTER DESIGNS

Magi, Magae - I entreat your aid! I am planning to join Never-Ending Winter's PbP on this very forum. This is, however, my first time playing Ars Magica. I believe I have grasped the rules (or at least enough to make a character), but I would be appreciative if eyes other than mine could look over my work for obvious mistakes, or perhaps to give me some mechanical advice if I'm making some obviously subpar newbie blunders.

Many thanks for the effort if you decide to help me out!

Note: for the campaign, there is the equivalent of one 'free' Skilled Parens virtue given to all characters. So there's a little bit more experience than there should be.
EDIT: This is in addition to taking the Skilled Parens virtue normally.

[size=150]Frederika Kassmeyer Ex Miscellanea [/size]

Characteristics: Intelligence (2); Perception (-2); Strength (-1); Stamina (2); Presence (0); Communication (3); Dexterity (0); Quickness (-1).

Size: +0
Age: 25

Decrepitude: 0
Warping Score: 0
Twilight Scars: None

Confidence Score: 1

Reputations: Academic (3)

[size=150]Virtues[/size]
Affinity With Art (Terram); Book Learner; Cautious Sorcerer; Doctor (in Law); Flawless Magic; Good Teacher; Hermetic Choreography; Hermetic Magus; Puissant Art (Terram); Skilled Parens, Unaging.

[size=150]Flaws[/size]
Dark Secret; Reckless; Difficult Longevity Ritual*; Susceptibility to Infernal Power; Weak Magic Resistance (minor)^, Weird Magic; Wrathful.

[size=150]Abilities[/size]
Awareness [Searching] (2); Charm [First Impressions] (2); Concentration [Spells] (2); Guile [Elaborate Lies] 2; Intrigue [Plotting] 3; German [Prose] (5); Order of Hermes Lore [Politics] (1); Profession - Scribe [Hermetic Text] (3); Artes Liberales [Ceremonial Magic] (5); Civil & Canon Law [Greater Alps] (5); Latin [Hermetic Usage] (5); Philosophiae [Ceremonial Magic] (5); Code of Hermes [Mundane Relations] (2); Finesse [Precision] (3); Infernal Lore [Demons] (2); Magic Theory [Inventing Spells] (3); Parma Magica [Terram] (1); Penetration [Terram] (3).

[size=150]Arts[/size]
Creo (10); Rego (10); Terram (20); Vim (5)

Spells Known
I am...still trying to work this bit out. I have no idea what makes for a good formulaic spell to choose at character creation so I'm dithering a bit.

*Ex Misc virtues and flaw.
^I need to talk to the GM about this one. Weak magic resistance is usually a major flaw. I'd like to barter it down to a minor flaw - active when Frederika isn't near a substantial amount of earth or stone. So sailing, flying - perhaps in areas where the snow is very deep, or ontop of tall wooden structures. That sort of thing.

The basic gist of the concept is Rika is a very...steady character right up until she's not. She's in control of her spells...until she isn't (then they go catastrophically wrong). She's in control of the situation...until she's not, and then she's raging all over the place. Her age is fixed, and she'll be alive and youthful...until she's not. Basically, an enduring as stone sort of theme, until the earth gets hit by something hard enough to shatter it.

The other half of her comes from her parens. Who I'm imagining as a very 'there is no bad knowledge' type concept - fully believing that knowledge should be shared freely, and there are few things greater than to share it. He took her apprenticeship very seriously, and made sure she was extremely educated. She embraces this sort of ideal wholeheartedly (with stuff like Good Teacher) and will probably end up as a bit of a seeker and a bit of an author. Unfortunately, Rika's parens was also a diabolist (Dark Secret) and she firmly believes that if that gets out, her reputation will be forever marred at best...with a chance of things being much, much worse.

Any critique is very welcome!