How do you all make such good OC's? 'Cuz i try and this is what i get.

Well, I know nothing about color-overs because I draw my OC's myself..
But, maybe instead of coloring over a raw character picture, you could try a base, if you didn't like your results before? Instead of coloring over a screensnap, like you did before, search up some TDI bases on DeviantART. And there are a shit load of bases here, too. With them, you could be more creative. Using your own skin color, eye color, and making the face look different, so it doesn't look like an acual TDI character.
I think your OC looks good, for a colorover ^^

Here, maybe this will help---

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Well I've been drawing for seven years. Once you draw well or very well, you draw OC's well. I drew this, if this shows you what practice can do:

Just keep practicing!

Practice makes perfect, hun ^^

I think your OC is cute for a Colour-over. I like her hair ^^

I think what TDIlover226 suggested is probably the best. Try looking for some bases :) Another tip to improve on your OC would be the program you're using to colour her. I know a lot of people use MS paint, and are pretty darn good at it. I never really got the hang of it and ended up switching to Paint.net which is a free program you can download. Gimp works great as well

If you decide you would like to draw your OC, just try drawing shapes on a page. Total Drama characters are made up of very basic shapes. Tyler for example has two rectangles for a head. And their bodies are basically triangles and circles. I'm sorry if that didn't make any sense. I'm utterly terrible at explaining things X.x

Hopefully a picture will help better than my explanation... Although it's pretty terrible as well

Well, personally, I think the way to make a good OC is by their personality and character. You know the word, Mary-sue right? I suppose you work on their personality first, then the story, then the looks. DON'T make too much OCs. Stick with one. Until you develop a good enough character, then you can make more. Its better to have quality over quantity. So, what I'm saying is, you should know what is the reason to have your character and where that person fits into the story. Read a few articles:
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link

I don't know. You can Google for more..

Well 2 make my oc and oc's 4 othr people i go 2 this link link