I actually think your prices are pretty good as they are, but you could probably go a bit higher. If the range you are finding is $2-$15, then yours are somewhere in the middle so I don't think buyers would think they are cheap, and they also won't be put off by prices that are too high.
I know the prevailing wisdom is to always go high because it is said to reflect quality and how much you value your work, but it also needs to be reasonable compared to what like items are selling for (when comparing apples to apples and not apples to oranges, so to speak).
Some good advice I got a while back is to not price items for what you would pay because you aren't your market. Price them for those who can't or don't want to do what you do and are willing to pay a good price for them.