the way tattoos work is the dye is injected into the dermal layer (the layer which doesnt "renew" during the tattoo however the ink also gets into the epidermal layer (which of course renews and "sheds")
as the tattoo heals the epidermal layer (which remeber is holding ink from the tattoo) will "scab" (though it looks more like a peeling sunburn than a real scab) and then peel off...as it peels off any dye in the epidermal layer comes away with it, (yes it peels off whatever color the tattoo under it is...i had fun seeing the many colors of skin on my bed after each of mine lol it was like one realy gross rainbow
)
of course as that layer peels it is replaced by a new layer of healthy skin, this new layer however does NOT have the ink to stain it, which essentially causes a layer of "clear" skin over the top of the actual tattoo...(which acts almost as a filter on a camera, softening the entire thing slightly, lightening it a little and generally the outerlines are much smaller than they origionally look)
so while they may not decrease dramatically id expect the eyeliner to end up 2/3rds to 1/2 its current line width... and should look softer and much more natural/like its just eye pencil...
i always found the way tattoos work and heal quite interesting, the skin is an amazing organ!
i think it looks realy bold and actually very cool as is, but its going to look realy stunning as it softens.
and btw you have very nice eyes with or without the eyeliner