DJK, excellent suggestions.
I would simply add that the choice of face design will depend on a number of factors. For example, magicians are very happy to find cool decks with standard (recolored) faces, because their audiences will identify with them more. If they go custom, it would likely be for a specific audience (for example, the Brazil 2014 deck when entertaining at a soccer viewing party) or it would be a variant of the standard face, still easily recognized as such (like the Artifice faces or Magic Con 2013).
Luke, the font - first, did you notice you misspelled "JOKER" as "JPKER" in one of the two colors? That's what happens when using a commonly-available but hard-to-read computer font rather than a unique typeface. If you're planning on using standard faces, you could just as easily use their standard indices. But if you're making your own with your own lettering, there's a few things you want to consider - most important of which would be ease of readability. A fancy Germanic calligraphy typeface isn't commonly used on playing card indices because it's really NOT that easy to read. Imagine trying to read an entire 300-400 page novel printed in that typeface - you'd go blind!
Look at a common pack of Bikes from the corner store. The indices are uniform in height and width. The pips are just as wide and about half the height as the letters and numbers. Some of the numbers have serifs and some don't - this is intentional to make the letters an equal width. Look at the "10", the only two-character index - it's devoid of serif marks and consists of little more than a stick and an oval, thus it's still the same width as a single-character index.
Does everyone use those design conventions? Of course not. People do all kinds of weird things with their designs - but the better designers do it for a reason, usually in some way that complements and blends with the design. Simply put, the rules of design can be broken, but you'll want to have a good reason for doing it or it will just look out of place.
