Based on that one image, I see a lot of other photographers with similar skills charging about $50 for a 3 hour session, and giving the client a cd with 300 images or so (usually unedited). That seems to be a very common plan today. As mentioned, Professional photography is more about being a successful business person, than being the world's greatest photographer.... and CODB is a good thing to know (and you will need to pay taxes, get insurance for liability and gear, business licenses, etc).
I would agree with John (Tirediron) that you need to work on your skillsets if you really want to go "PRO".
I would recommend learning about exposure (you have fried highlights above), basic lighting skills (you have hard shadows / fried highlights above), basic composition skills (your framing above is very tight - it could not be framed as is, you cut off your subjects foot, the foreground is busy and unattractive, the background is ugly, etc...). I would also strongly suggest upgrading your equipment! While a knowledgeable professional could work around the limitations of your Canon Rebel, it takes a lot of knowledge and experience to be able to do that. It lacks the dynamic range you will need to shoot low light situations, with low-noise high ISO. I am assuming you are probably using a kit lens also.. and they are seldom the sharpest lens you can buy... or the fastest. You also probably need to learn to use flash / strobe with modifiers, and purchase those if you are lacking them.