This is really, really lovely! I love the fact that you incorporated the envelope (?) into the piece. Beautiful colouration.
Very nice. I like the collage-y feel and the puffins are great.
Thanks for the lovely comments. I used an old postcard I had laying around to add a bit more depth and texture to the piece. It also ties in with the 'return' theme.
I like this, very catchy design!
I really like how it appears to have been drawn on real mail. Nice composition, even without that unique element! Well done!