Optimising website images is important in SEO for websites. The ALT image attribute is a part of SEO that is often overlooked. This can be a lost opportunity for better search engine rankings.

In Google’s webmaster guidelines, they advise the use of alternative text for the images on your web site:
Images:
Use the alt attribute to provide descriptive text. In addition, we recommend using a human-readable caption and descriptive text around the image.
Why would they ask us to do that?
The answer is simple, really; search engines have the same problem as blind users. They cannot see the images.
Create a content rich, informational site which is loaded with quality articles, tips, free advice, and tutorials, and keep your options to buy a product very subtle.

The number one reason most people go online is to look up information, so the key is to discover high-demand topics for a niche audience and give your audience exactly what they are searching for first. Satisfy their search first and then offer them the option to buy or use your services.
Here at Customer Street we try to offers small hints and tips on how to improve your website and help you get a better ROI from your online brand.
Does Google change their algorithms to artificially promote new pages?
Hard to say but there is evidence that QDF exists.

What is QDF?
Google calls the Query Deserves Freshness (QDF).
The QDF basically looks at the current search volume and then the blog post volume to determine if a subject is considered to be hot. If hot, then Google may promote new content to the top of the results. But if this is from June 2007, why are we first really seeing this now? BlogStorm said because there was “no previous search history” for that query and that is why we now see tons of new results.
Did you know that if you write your content so that it naturally “reads very well,” you will naturally gain some bonus for having created content of quality.

By this I mean content…that reads well to a human being.
You don’t need to stuff keywords all over the place. Instead, use moderation in everything you do. One of the things you need to understand is that “theme based” search engines like Google, are actually using a measure of artificial intelligence (AI) to measure how well your article “reads” based on all of the overall data that a search engine has gathered concerning a specific topic.