Actually, it was my little daughter the one who inspired me to make this card as she was trying to teach me how to work without masking, she said that masking was unnecessary and ugly lol. 

Her idea was to stamp a scene where the snowmen were jumping,  dancing or messing around and  we could stamp the hats like if they were falling off from the snowmen head so that we didn't need to worry about masking.  We could also stamp presents or anything else here and there so that we don't need to worry about the background neither. lol

I said - Ok, let's do that and to be honest, I liked that way of thinking lol. 

Although at that moment, I already had stamped one of the snowmen with the hat on. Can you spot him? For that one, I didn't use a mask either.  I use the Tim Holtz stamping platform to know where to stamp the hat first and then when I was inking the snowman stamp, I cleaned the part that would overlap the hat image. No mask used.