Glad you're trying different poses. I would fix her back though since her pose, I assume, is her slouching. Also maybe make her hands bigger and her legs and feet look a bit.... off. Also, try to learn to draw hair. Aside from that, I dig it and the color choices are above average. Her facial expression is pretty cute, too.
She looks cute and the background is smooth.
You really like this Tea gal huh? Wel i guess i can check her out later. I really like the fanart, such a wonderfully simplistic design and small color palate, looks good. The facial expression and quality is great, plus the background was nicely done, really smart and simple. My only critique here is her pose: it's a li'l blah.