Well I'm not sure where to start exactly. But I'll do my best to Critique.
I think it's simply stunning, and Quite appropriate for a drawing meant for someone else! The colors are dark, and I like that. It sets the whole mood of this piece, the purple really complements the black and the bedroom is an amazing background. :3 I like her expression, gives off a "just for you" feel to it, and I like the tongue stuck out, makes me feel she's happy with it. and the position is perfect for a personal piece, I don't see it looking compromising in any way, and I'd think the character sees it as such tool
I like how the clock reads "1:00", perfect time for a nude photo to a partner if you ask me keep up the incredible work ^-^