FYI, Ewa, I noticed you mentioned something about not finding a fine-liner you like yet. I used white and gold pens. Best ones I've found so far are an obscure brand, came 6 in a pack, Gethpen. 2 of each-white, silver, gold. Directions say to keep them upright when using them. I followed their directions, and they work beautifully.

 

Very fun project! Thanks, Ewa!