It doesn't look bad at all for something done with a mouse.
I knew somebody who drew with only a mouse up until maybe a year ago, and their stuff didn't look this good~
And mind you they were drawing like that for at least ten years. XD

Your proportions are pretty spot on as well.
A little bit of weirdness in the far arm's posing, but it's just a particular pose I personally avoid. lol

Overall, I think you did a pretty good job and you have a lot of potential.
Keep it up and you'll be making some really nice things in the future~

Thank you. The trick is to draw with the mouse requires many preparations. Mouse must have DPI button, second point mouse sensitivity in mouse properties, should be big and heavy, wide mouse pad, and use it in a comfortable position.
I tend to draw while standing.

Arm is weird, I know. I need to find a reference for a pose so I can draw such poses easily.

I guess, my knowledge of the gesture drawing gave the drawing a better look.

That is actually a lot of things about drawing via mouse that I did not know. lol
It sounds like a lot of things I'd hear in the pixel art communities~

The pose isn't too weird. I think what I had a problem is where the depth was compared to the chest and belly.
I can't remember when I noticed this in my own art, but I think it was with this:
http://www.furaffinity.net/view/4632345/

Like...it's not wrong...I think I might have tried to do the pose with myself as a model for it, and just not liking the way it felt.

But, yeah, good on ya for using references. I can definitely see that you have a decent understanding of how things generally work~

your drawings looks fine.

I think I made my drawing better because I drew the gesture figure first.