gijinkas: fluttershy

First off, don't take the low star rating as an insult. It doesn't mean your drawing is bad, it just means that there's a lot that can be improved on.

Judging by the straightness of the pose, and the reversed right hand, I'm going to guess you drew the figure from memory. You have the basics of the pose down, but you can tell something about it doesn't look right. Using a human reference for poses, even simple ones such as this, can be incredibly helpful for catching the little details you don't think of when drawing from memory. Take this for example: [link] the closest approximation to your pose I could find in a quick Google search. Just by looking at it, you immediately pick up on a couple of things that you wouldn't normally think of when you think of a girl waving her hand:
- Very little of her is straight up-and-down. Her weight is resting on her left leg, her knees are bent, her abdomen is thrust out to the right while her shoulders lean left, her dormant left arm is bent, and even her head is turned a bit. Her ribcage is turned pretty far to her left (though it's kind of hard to see in this picture).
- She doesn't make needless gestures, but every part of her is occupied and has a purpose: her weight is on her left leg, which leaves her right leg to freely swing and bend, as it's doing in the picture. Her right waving hand isn't just held straight up - it's bent back, as though she's just about to wave it forward at the viewer. Her left arm, which isn't doing anything, is hung loosely on the belt of her skirt. Her head is tilted forward and turned slightly to one side, like she's talking or gesturing to the viewer, instead of being straight-on, which would look flat and unexciting.
- Every part of her has distinct curves. Her legs, in particular, bulge out very distinctly, as do her arms and hips. When we think of people standing around in poses, we don't usually think of the underlying muscular structure - we take it for granted. But if you don't include the resulting curves and form of the underlying bonework and musculature, your human is going to look simplistic and robotic.
I recommend reading up a bit on human anatomy - not much, just enough to understand the major bone structure and musculature in the body and how they all connect to make people look the way they do. Check these out: [link] [link]
For drawing practice, I really recommend Posemaniac's Thirty Second Poses: [link] It flashes anatomical human models on the screen for thirty seconds (or whatever you set it to) and you have to sketch it out in that time before it changes. Not only are the poses good practice, but drawing in a time constraint like thirty seconds forces you to ignore your generalized interpretation of the pose in your head and makes you draw what's on the screen. It REALLY helped me learn how to draw humanoid poses better.
I hope this helped! Keep on drawing! :3