I really want to help you as I'm also new to pixelart and know how helpful some feedback can be.
That said I myself have not much of experience ( a few weeks into pixelart no characters so far ) so use with caution!!!
Overall I like your character, the colors, the art style really nice!
Is this supposed to be a battle pose? Or just the standing still pose?
I did the following: I stood up from my chair and tried to do exactly what your character does.
If you do this you will realise that it somehow feels unnatural.
If it is just a standing pose:
Why is one foot on it's toes? Why the arms are in a 45 and 90 degrees angle? If it's just standing put both feet on the ground, closer together and the arms just in a small angle like 5 degrees or so. More relaxed I mean. If it should Idle, you can simply do that by moving the upper body a bit down and up so it looks like breathing.
Like here
If it is a fighting pose:
The arms then would need to be more in front of the body and a bit higher to be able to block the face. Like a boxer I guess.
The foot is fine then, alternatively put it on the ground completely and then perhaps a bit turned.
Hope it gives you some ideas^^
Greetings
Kroan