Excellent work, also the attention to all the original detail of render, clothing, classroom items, etc.
Celia seems to be teetering in a sort of unstable balance, perched on about a millimeter's width against the desk's edge, but that may reflect her extremely disturbed emotional state.
Or maybe it's those gigantic "knockers" keeping her from toppling back over the desk! Wow! (Anyway, her backside and breasts, if anything, outdo even what most of the game offers!) I love the way you've got her legs and face exactly right, both the near-photographic level of convincingly lifelike and the accuracy to the game.
I thought for a moment her bookmark had the shape of a penis, but I guess that's "going it strong" even for our closet sex maniac Celia! She has more public sense than to flaunt such a drastic symbol in public - even if privately she's burning up.