Hello Victor!
I'll try to help you a bit.
There are some really good things going on here.
-You are using big clusters of pixels.
-You have a solid lightsource.
-Your colors are choices are working and you hue shifted every color.
-You've made some careful pixelwork. (Nice job!)
But there are some things that I would try in a different manner.
-You anatomy seems to be a bit off(Short Legs and really thick arms/torso)
-This pose is not great. For an american plane it is nice but in a full body shot the legs are uninteresting.
-The head has some confusing pixel angles. I tried to suggest a more 3D position.
I've also made some changes.
-Moved the legs a bit but tried to keep the pose.
-Made the person more slender.(Making the person more feminine was an accident, sorry about that.)
-Made and example of how I would make a face.
It seems you got a bit lost when you had no reference to follow. That usually happen and you will have to study a bit of anatomy to get over this.
I also recommend you study action lines. Gesture drawing helps a lot in this aspect.
Here's how I would approach those issues:
Anyway, hope it helps!