I find that with masking images, that I need to plan out those parts of the card ahead of time. It's kinda like doing a puzzle to me (but I like puzzles) and I do have to stop and think about what goes where before stamping.
Now there have been times where I'd like the stamp image to be behind another one but I'd be too lazy to mask a really complicated image. In those cases, I try to see if there is a way to get around the masking and still have what I want stamped in the back--- again, that gets me back to doing another "puzzle".
sometimes it works and sometimes I scrap the masking all together and sometimes I just go through the fussy cutting to get the mask made.
This paragraph is not to derail the thread but: How complicated is TOO complicated for y'all to mask something---which basically means, how complicated of an image will you fussy cut to mask? I think I know Daniel's answer!
I tell myself I only need to cut this image out ONE time then just keep up with it for future maskings---in which case I put a piece of removable adhesive on the back of the mask and store it on top of the stamp---how do those with unmounted stamps keep up with your masks?
I realized I only spoke of masking. Before I comment on layering I want to double check: "layering" is putting an image on top of another right---so for example I'd have a base with a stamped image on it and the put a stamped image I fussy cut out on top of the base layer? Or does layering have to do with masking?