To be honest I think your CGs really shows that they are made rather quick.
Take your time with coloring, especial with only a mouse.
I personaly hardly finish a coloring in 5 hours and with a mouse you should need more time not less.

Also make shadows.
All you really do is slap some highlights on a base color.
Sure the higlights are usualy perfect in place, but highlights are 2% of coloring and only the last step.

Experiment with the program.
Coloring on the pc has the great advantage that you can "undo" steps you dont like.
And they have layers so you can experiment with the coloring quite alot, without damaging your drawing.

Dont get me wrong, I like your drawing they are great and show a good junk of creativity. But your "I cant color" whining starts to get on my nerve.

I mean remember all those Animes, where the hero in the beginning is a weak guy.
He becomes a strong skillfull person 'couse he puts his mind on it and trains day in day out.

Become a coloring hero Neo you have the ability for it(really no joking).

So sorry in advance if I was to harsh.
But I think lies and kind words wont bring you forward with this.

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Wer nicht vom Meister lernt, lernt nie etwas.