Maybe I should put the pip on a shield like the number cards? I just wanted the aces to be a little different then the other number cards.
They already ARE different. They're big and bold. Isn't that enough?
The theme of the deck is Coat of Arms. The name of the deck is Coat of Arms. Incorporating the Ace designs into a coat of arms would seem to be the way to go here. Like I said, in their present form, they look more like tattoo flash than ancient clan symbols. Perhaps if you want it a little more different, you could place the Aces on wood or perhaps a cloth banner, as one would do with a symbol that's hung on the castle walls, rather than using a shield.
Did coats of arms often have scrolls with writing on them in English? I would have thought Latin or some other ancient tongue more common. It's worth a thought - using a different language. Heck, you could try thematically dividing the coats by the countries in which they might have hung. For example, the Ace of Clubs looks close enough to a fleur-de-lis that you could easily imagine it as a French clan standard - so write that scroll in Old French (you'd want a standard's scroll to be written in the period-correct version of the language rather than the modern usage). One can be Welsh, one can be German, one can be Italian. Scottish and Gaelic would also be worth considering.
BTW: nice touch, incorporating the old German versions of the suits on the Aces.
A question comes to mind. We've seen your Jacks, and they're OK. But I think they could be better. Consider creating two separate shields in the corners opposite the index. Do away with the helmets. Make a simple yet regal coat-of-arms design incorporating the appropriate suit, and make the framework around the coat of arms more ornate and "royal" the higher in rank you go. The Queen's coats of arms can actually be placed on a silken kerchief of pink or white - if I'm not mistaken, female royalty were known to give a similar "favor" to a knight before a battle or a contest of fighting skills, either for luck or to indicate attraction.
Even simpler would be to make the Jacks with reinforced steel shields, the Queens with silken kerchiefs and the Kings with gilded shields. There's a lot of ways you can play with this.
For the number/spot cards, consider a mix of standard shields and tower shields. Tower shields would be especially appropriate for the higher-ranked spot cards.