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this is a spectacular idea. i would say only tiny tweaking to make it completely awkward-free. sharpie is good. i think the finger lines don't really make sense, the ribbon is the reminder. but i see why you added them.. i wonder if dotted lines might be a good strategy? maybe you don't need the lines at all?
i think you should add the ends of the string that come down off of the knot. i made a rough addition in photoshop and attached it below.
great work on this, i love the idea and your execution so far is fantastic.

on this one, I will have to disagree with you miranda. The not without the finger lines does not work as well as with the finger lines.