Pretty good start, heres some feedback, though.
Outlines
The white outlines aren’t that straight/neat, which kinda throws the overall look of the image. I do like how in some places the outline is thinner than other places, though. I did notice that in some places, though, the lines didn’t quite meet together, or where there were just some little bumps, as shown below:
Colors
The colors where very vibrant and well, colorful! I did find it a bit off-putting how you put orange on the beanie considering all of the blue in the drawing as a whole.
The background
This is my final nitpick: The background. In my opinion, the pink is a tad bright. The background is normally used to fill empty space, but not to distract the viewer from the centerpiece of the drawing. I think that toning down the pink a bit would honestly go a long way. I also noticed the gradient was a little… wobbly. Some examples of gradient backgrounds you’ll see have slightly smoother ‘transitions’ from one color to another, as seen below.
And that’s all! I really hope that this helped you out, even the tiniest bit : D (also remember to mark this as solution if you consider it a… solution)
Great work, and happy drawing 
Looks like a quick draw from paint . net.
Yeah well it is. Made using only a mouse.
Thanks for your feedback, I’ll be sure to improve on this next time!