I think a card for airmailing needs to be light and flat (unless you want to get into sending it as a parcel!) so this is a one layer card. The recipient teaches maths so I went for a numbers border to tie in with that, stamped with grey ink over a masked butterfly.
A charcoal pencil shadow adds a bit of depth to help the image pop off the surface and there's a wee bit of shimmer on the butterfly's spots courtesy of a Wink of Stella pen.
Antique Engravings and Say It All by Hero Arts
Numbers Border by Kaisercraft
Paper: Smooth white
Brilliance Graphite Black by Tsukineko
Soft Granite by Hero Arts
Wink of Stella clear pen
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