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I am working on a site which will be a portfolio of many photographers - hence there will be a lot of images - each image will have an external link to the photographers site, there will be a very small description and a lot of tags (for the site indexing to work) Bearing in mind that the site will consist of 90% images, 9% tags and 1% text is there a chance the site will rank well for my keywords (which will be the tags)? There will also be social comments e.g. facebook or discus but I want to keep the amount of text to a minimum.

Why is it that when you google a domain like yahoo.com you sometimes get a main SERP and 6 sub SERPs below it. This concerns the 1st position.

If my site is not in the first 50 results and the keywords are medium to highly competitive? I have just started adding to directories, planning out a blog, fixing seo mistakes, updating sitemaps etc. The 1st ranking competitor has external links in the tens of thousands whereas I have maybe a few hundred. I see a light at the end of the tunnel as competing sites in between me and the 1st place ranking competitor have external links only in the 1000-2000 level. We are an ecommerce site and want to be ready for our high season which is Nov-Jan.