I agree with Kanped, gradient =/= to shading. oh and welcome to the boards!

I'm abit confused, where exactly are you going with this deck? The first drawing seemed to me like a mix of the ellusionist's 1800 and like sort of a carnival themed deck while the seconds seems abit out of place, I noticed you used the same 'banners' you did like the first drawing but i'm sorry I don't really fancy it, it looked okay without the colour applied to it so maybe its the colour or might be the lack of shading or might be the 'vintage' colour of the paper it was originally drawn on, I'm sorry I can't seem to pin point exactly where though..
from the name of your deck the 'mystery' part and the 'inked' (artistic) part fit really nicely for the first drawing, well done!

I like how the slight vintage look of the first drawing, gives it abit of a mystery while the colours add in to the artistic side but the background seems abit empty to me.. well that's just my opinions, good luck in creating your deck! hope my opinions help!

btw i love the artwork of the flower, it's really nice and calming~