Hi Elisabeth,
I took a look at your site (although I don’t speak or understand Spanish), what I do like is the clear looking type on your page, but the way it’s laid out, the type is aligned ‘center” try putting your image at align=”left” and the words will ‘wrap around’ the image, rather then having a couple of words on one line.
Use your alt text eg alt=”Bwin PartyGamin” — put your keywords in the alt text (great tip for density)
And I have to say the yellow is a bit of a punch to the head when you get to your page – maybe have that at background colour and have the text on a white or off white background
Also see if you can align the page to the center of the web page and make the width 750 rather than 100%
Also I believe that you should have your links to the betting sites open in a new window – that way they can get back to your page right away