Thanks for your comment!!
It has a lot a things that now I can do better... im learning and improving along the way...

I must study deeper the color theory jajaja

Sorry if my english is bad, im Argentinian <3
 

That's helps a lot, thanks!!! 
I will see more tutorials of this guy.
 

This will be help u how understand metal shading.

https://i.pinimg.com/originals/02/5c/23/025c23f0ac3a34c4449dac78f1cccb09.gif

Be careful with your contrast. Too low of a contrast can make things look too blended or even give off a faux blur feeling. Cute design though, keep up the good work!