Low saturation is ok if that's what you want, as long as you can actually control the colors. You should check your work on many monitors to make sure about it. If you are serious about being a graphic artist / designer (pro), you will absolutely need to get good equipment.

So I must work harder to create contrast in my work?
I tried not to put so saturated colors, to avoid disturbing the view.

What advise me? 


 

This definitely has low contrast and saturation, as many of your pieces. Looks like your laptop is the best option, or at least the less bad! (laptops are never good)

It's essential to know how your monitor messes with your work. The ideal is to get a good monitor + calibration device + calibration software, but this is (very) expensive. At least you should check your monitors with online 'calibration' tools (there are many, they can't do an actual calibration because you need a probe to do that but they can give you an idea of how much wrong you are. Here is a simple one to check contrast, highlights and shadows)

If the banding fix, but can not find Pilow shaded, about of the low quality, it really depends on which monitor and possibly desaturate the colors for the border and base.

Also depends on the monitor, for example in my N3DS whens and load the image, it shows as a normal sprite, WHILE in my laptop feeling low quality.

Thank you for you feedback!!

the base is a bit blurry and has lots of banding issues but the clothings are very good.

My only issue with it is that you've kind of pillow shaded it, which I feel brings down the quality of your sprite.