You hit the nail on the head, James. I read a magazine called "Computer Arts", an UK publication, and it has articles dealing with breaking into the business of graphic design etc. One of the main things to remember, is that when you are hired by a company, or freelancing, the client will provide a brief, explaining what they want; the mag even has demonstrations, where they send a brief to 3 or 4 artists, then they show the thought processes involved and the final outcome...usually completely different but still getting the message across.
Azel, for you I would say to stay freelance and design your stuff. You can sell original designs and artwork...it's just ST related stuff that is off limits. I know I would love to be able to do that myself, but I'm more technically sound that artistically. Show me a design and I can probably do a good job recreating it, but designing my own stuff...well let's just say the few I have done were baaadddd, really baaaddddd.