I get why this is boring for you. The color is so subdued. Compared to how wild you normally go. All those earth tones, not you at all in my opinion. And the pose, and expression, no life here, just someone smiling and not very exciting at that. Your work is so much more full of life. And while this to me, seems like an exercise for you, it's so not indicative of your normal amazing style.
Just practicing? Shit, girl if only I could practice like this.
Serious point though, I know some artists believe their best work is the most spontaneous and therefore quickest. As one (professional) told me recently if it takes an hour its good, two hours Ok, three hours - put it in a darkened room and forget it.
One minor crit: the blob near her right shoulder is nipple shaped (and in the wrong place) - which I find confusing. But then I'm just a man...