I have a question for our experts on heraldry.

I have an acquaintance who made known to me this evening that he wishes to utilize this Clan Donald image in a tattoo design:



however, due to areas already covered in ink, he wishes to place the design on his right bicep, but wants the image "facing forward", thus he plans to flop the image like this (though with the words "Fraoch Eilean" reading the correct way of course ):



This got me to wondering, and thus my question for the 'experts':
is it permissible in heraldry to flop such an image, or is this considered a no-no? Would it be considered okay if the galley & eagle on the shield were facing to the left (as in the previous image)?

(..there must be something in the air, first I start a thread about regimental leg tattoos, and then this situation pops up!)