There are a few points to remember when presenting a CV and covering letter.
Do always spell check your letter and CV before attaching it and sending it. It's <F7> in a word document. If you limit the value you place on your application at close to zero by saying you can't be bothered to do this simple task, you can't blame us (or any other potential employer) for placing a similar value on your application.
Generalised applications stand out like a sore thumb. Please write something about yourself. You must have done a few things of which you are proud or which you enjoyed and may be relevant (however obliquely).
An example of generalisation which has a negative impact for us is: "I am an (excellent) team player". It's a standard phrase in almost every CV example on the internet. It is used so often it has become meaningless in distinguishing you from the crowd. Indeed it places you firmly in the "average applicant" sector where employers are usually confident there is going to be someone with a little more spark. If you really are a team player, then there must have been an instance or two where you have demonstrated this. Please tell us about them and let us judge from your examples.
Another example would be "I am quick learner". It's another standard phrase in almost every CV example on the internet. If you really are, then there will be an example or two where you have demonstrated this. Please tell us about them.
Strangely if we receive an application from someone with well above average academic qualifications, the "I am quick learner" phrase seldom occurs. The corollary in respect of commercial aptitude is also seems to be true.
Example three would be "I am enthusiastic and self-motivated". It's also standard phrase in almost every CV example on the internet. If you really are, then there will be an example or two where you have demonstrated this. Please tell us about them, even if it takes a couple of paragraphs to explain.
So what should you do? Well here is a fairly narrow example: Say you think you like to work for us as a web designer? We would have expected you to have published at least one web site off your own bat, preferably more to show some staying power. We would expect links (URLs) to be included to those sites where you have participated in the development. We may not like the design of the web site artistically - the customer for the site may have a completely different target audience to us, so the exact artistic style is not relevant, providing there is a clear style. We would expect it to be technically well constructed. In doing this you have shown clear self-motivation, and since you have done more than one, continuing enthusiasm, the ability to learn (to the quality illustrated by your sites) and since hopefully the sites were done for the benefit of someone else, the ability to work as part of a team: you and the site owner. In simple terms for this particular post, a couple of URLs have almost the value of this entire page.
Observing all of the above won't guarantee a job with us. We may not have a vacancy at the time or you might be pipped at the post by someone just that bit better experienced. It will guarantee that we read your CV and covering letter and give it consideration, because you have just placed yourself in the top 5% of applicants (in our opinion). It will also make your application memorable, so if we don't have something at the moment, we may contact you in the future.
Good luck.