If you’ve scanned or gotten the images at at least 600dpi, and preferably as black and white bitmaps, you’ll be fine (though I only have experience with magnesium). If the res is too low or you don’t change them to black and white, then you’ll see a halftone screen in them, which isn’t so nice. Hope that helps!Jen
If you are using polymer the line weight needs to be .25 pt or higher. Otherwise there is no guarantee that the lines will hold. Make sure to pay attention to the weight of the serifs on your type- that is one area that I have found a lot of people overlook.Good luck!