I don't know what you have over there, but here there's something in a can called Defthane. (company name Deft) It works pretty well over paint pens and that sort of thing, and it will stick to Ibanez' poly finish too. You could shoot it with satin or gloss, or satin first as a sealer, to defract the light and soften the mild inconsistencies in the pen image (which I think are cool by the way) and then follow it up with gloss. It takes days/weeks to cure but it's pretty hard for a rattle can.
Deft is nitrocellulose lacquer, and the spray stuff (not the brushing stuff) is pretty good.
I expect that it would go well over the felt pen and probably would go on well over the existing finish. My concern would be whether it would STAY on over the old finish. Given the differences in flexibility and expansion rates versus the poly undercoat, there have been cases of the lacquer cracking or popping off in the future. I can't say whether it would happen in this case, but it is generally not a good idea to mix finishes. (I definitely wouldn't put poly over nitro.)
In any case, the guitar looks good. Good luck with your finishing.