>>7746062 (OP)
Trying too hard to draw with "quality" instead of feeling.
The art at the top has more motion, clear expression, thick lines, overlap of the character and a great composition.
The lower one has excessive negative space, the character looks more stiff and just less lively.
It's like when an artist zooms in on a picture to perfect every detail and loses the bigger picture in the process.
Personally, I think if an artists art improves, it gets a little worse at first due to being too distracted by technical details to convey the feeling you want to, but the art will get better too once you're more comfortable in your skill and can focus back on conveying a message rather than just drawing a pretty picture.