I would change the header, make your G2 logo image smaller and put it to the side, put a stunning image of a gecko, preferably not albino, something with colour into the header and use the colour scheme of the gecko to tie in with the grey and white of the body. Make the Gecko Geeks into an
tag in the html file and place it underneath the G2 logo in the header. For the moment all your title information is contained in an image, people with images disabled will not see any information about you.
You can browse through colour schemes at kuler dot adobe dot com and you can browse through web designs at getfreewebdesigns dot com to give you some inspiration for your logo and header.
It is great to start young, you will learn a lot and quickly, don't get disheartened by constructive criticism and bear in mind that everyone's taste is different. Good luck.