Colin Noble in a Radical SR3 at the hairpin, Knockhill.

This isn't bad - particularly if you are relatively inexperienced - though there is a fair bit that you could work on in order to improve your shots. The light you were shooting in looks pretty terrible and there's nothing much you can do about that, but there are a few other things that you can do something about.

While I do like the angled composition, I would much rather see a little more space in the upper left part of the frame so that considerably more, if not, the whole of car behind is included in the shot - it would put the battle betweent the two cars more into context and also show something of the circuit. As this picture stands, it could have been taken anywhere...

Also, focusing and sharpness are a little off; I know the 300D has some limitations, but you could either manually pre-focus on the corner apex and wait for the car or shoot this in sports mode so that you get full use of AI Servo focusing. Also, make sure that you are shooting at a shutter speed of at least 1/400 of a second to reduce any effects of camera shake and subject motion in order to improve the sharpness; while not a hard and fast rule, it is a good baseline from which to work.

In terms of selecting where to focus, always put the focus point on the driver's head of an open cockpit car or on the windscreen sticker / sun visor of a saloon car etc.

Hope this is useful to you! :-)