Random guess would be around 40-45 for initial salary, but the company +/- that based on your performance.
Seeing as they're keeping you on, it can't be too bad.
also depends on what kind of work you're doing for them.
If you're doing graphics for the buttons on a website, that doesnt amount to much.. but if you're doing graphics for the front page logo that everybody sees and has a real impact then that may improve the salary.