Hi, Nartoonist! Sorry for the delay, I've been busy for a while and the last time that I came here in deviantart was months ago...
First, I'm glad that you liked my work! Thanks!
Well... been a cartoonist, a illustrator, an animator... I can say to you that using Photoshop or any other graphic software helps a lot in the process, but the main key to make good arts relays in find out how are your own process. It doesn't exist a default for this. There are people that makes everything in Photoshop. Others, like to make the sketches in paper and finish the job in another graphic software. There are people that makes everything in paper, and just scan the job. You need to work out in your own process, in most of the cases, it takes time to know it.
I saw some of your works and I can say that, the drawings made in Paint are good for a tool like that, and you make good things in paper too. I think that you could start making sketches on the paper, then scanning this and finishing using your wacom pen tablet for colors and other things. Or, if you want to make everything in the computer, you will need to learn how to skecth in a graphic software.
If you can't afford or even dont like Photoshop, you can use another free graphic software, named Gimp. The thing is that a software that have a layer system and works good with pen pressure for color opacity and another details, helps a lot, so it's good to learn the basics to use a software like this.
I don't know if I was able to help you, but to simplify the things I could say to you: aways study hard to improve your drawing and graphic skills (even you're good, you can always get better), try to find a process that fits your style, and try to find a graphic software that you could use. Paint is a drawing tool, but is really, really basic. Using another tool will improve a lot your work.
If I can help with another thing, just tell me, ok? Good luck and good work!