Lets see... Earth is easy, water is relatively easy, air could perhaps be the sky? Fire... Unless I did a sunset I'd have like, no idea how to do that. XD;; I mean I might be able to draw(with the wax-pen thing) something on it, but I risk it looking awful and ruining what I'd already done... XD As for spirit I've for no idea what I could do... A star maybe? xD;; Because I can't draw like a grey blob or something. XD
Picture with water example Not my best example ever, but it was a first attempt.
But... I'd have to say, due to complexity... about 60ks since my hands would probably turn into wax covered toast after I'd finished. XD;;