I agree. There should be more layers for markings (I say "layers" because you are overlapping them).
At least three in my opinion.
Seriously, there's a lot of players complaining about "copyright" even though they're rping as basic characters. For example, a white wolf with grey toeless socks and tailtip with a back mane. Who is NOT going to have the same idea? :/
Also, not only would using multiple layers of markings prevent the whole copyright business, but it would add some more creativity to the Character Creator. You would be able to make lots of combinations and if I was good at math, I would tell you the number of combos you can make using the markings we have now with 3 layers! 8D