See how close it looks to Alvin Seville from the Alvin and the Chipmunks Cartoon Series?
Just very slight lack of shading.
Recommended Programs! -
Paint.net [ Not a website. ]
Photoshop may or may not bring out good results.
If your drawing suffers from gaps [ White lines around the edges after filling in ], Then there are two ways to fix this.
One way -
Use the the Line Tools [ Most Programs have one ] and slowly cover the white gaps with Lines that are the same colour as what you are trying to fix.
For example. If this drawing had White Gaps around the Red Cap, Then you would use Red Lines to cover the gaps. etc.
Second Way -
For more experienced users but new users shouldn't have too much problems.
Add another Layer then move the Layer down so it is beneath this one [ Layers let you add to pictures without messing up the current one ], Then slowly use the Paint Brush tool and the color black. Slowly cover each gap from underneath to match the black outline.
Not all Paint Programs use Layers.
Microsoft Paint would definitely be a bad choice.
Paint.net offers the best Layer Editing System.
So does GIMP 2 but GIMP is a bit more heavy and needs you to anchor the Layer.
I will probably upload this as a Tutorial on YouTube.
This is just to give you a thought that If you ever need to test out a new look for your OCs, Then my Bases are Free to Use as long as you provide credit and a link to my Deviantart Page / InkBunny Page. ;P
That way, When people see your work, They will know where to get the Bases from and see If there are anymore available.