Yes, you could do point commissions, open up a donation pool, or ask to someone nice.
Point commissions are much more convincing, it depends on your skills. Make the price cheaper, so many people will order to you.
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You type in How to get wii points free and you'll have to fill out some stuff and you'll have 2000 Wii points
There are many blogs which tell you how to get free Microsoft points. No, this is not illegal as you are will be entering and filling in surveys.
Are there any hack for free speedy reward card points
On DeviantArt, a request is essentially you drawing something for free for a person. This can be great for those who are still working on their craft and perfecting their talent. Commissions is when the person would pay you for the work. If someone asks if you do either of these, simply reply to them if you do or not. If you do requests, you can simply link or tag the person in the picture once you post it, so they know its for them.
DeviantART is a good, free, well known site, for submitting and browsing various artworks including fanart to the Sonic the Hedgehog series.