The problem is I don't have confidence in my work I know I have improved there are many more skilled artists than me. But I have to earn money and don't know as of now How much people will pay and accept my artwork.
Why don't you show your work here?
Do you work with front end, or just logo?
Maybe you should try to expand your abilities and try many types of designs, maybe even create a website to show your portfolio.
Working for free is a good idea, specially if you need a portfolio and experience.
I created the website in my profile just to learn, it was like working for free. A few months later I joined a bigger projects and made some bucks.