Thanks for your suggestion hahaha seems I am a sorehead artist with low-level skill , xD

That's a pity! I'm in kind of the same situation. But as far as your artistic skills go I could suggest you to get in touch with developers of games which this type of art would fit in to. Like the games you play for instance. I hope they'll be interested!
It could be worth a try, if nothing else as an extra income, best of luck to you :)

Yes ^_^ But sadly I have no job now... and don't know which company will hire me..A little bit worried

Have you ever considered doing this for a living?