While I'm sure you do have a lot of experience in the field, I am unsure of why a potential customer would choose your service when they could go for something thats looks more aesthetically pleasing themselves, e.g. there are a lot of sexy-looking Wordpress themes that you can use for no cost.
I do have quite a lot of experience in PHP and MySQL coding. People would want to hire me to help them develop custom web applications like E-Commerce, or needs their website backend rewritten. I will admit I have to work on the aesthetics aspect of my website.
I would add demos if possible, rather than code pastes. A customer looking for a programmer probably won't be able to understand the code completely without a demo. I'm still not sure what's up with the floating elements on the homepage and the backward letters in the navigation. I'm curious how they came about now.
Anyway, it looks like your MySQL API is a loose wrapper around mysqli, and could use some better indentation. It also looks like you're misusing OO PHP since you're using an object field to store $result, which is seemingly temporary data per call of query() or fetchresult(), which is definitely not threadsafe. You're also assuming that everyone wants to use utf8 as a collation (not necessarily true), and that the connection should be made using a TCP socket rather than, say, a named pipe.
it also doesn't look like you've tested your code thoroughly:
I hope that these comments might be helpful for you to improve your code.