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Even if the image is decorative, it is still describing the contents of the image to visually impaired users. Here's more from Google:

https://support.google.com/webmasters/answer/114016?hl=en

From Google:

"The alt attribute is used to describe the contents of an image file. It's important for several reasons:

It provides Google with useful information about the subject matter of the image. We use this information to help determine the best image to return for a user's query.

Many people-for example, users with visual impairments, or people using screen readers or who have low-bandwidth connections—may not be able to see images on web pages. Descriptive alt text provides these users with important information."

The image's decorative value is for the user to judge, it's about providing the full story and experience to all users not some.

Hi Becky,

I would not create separate product URL if the size/color are the only variations in the product description. If you do this, you're risk creating duplicate content since there's not enough unique content for each page other than the title itself.

Create one page for the product, describe all relevant information for the user, and use filters to display the size and/or color variations.

Here's an example from Amazon and how they handle products with size/color variations:

http://www.amazon.com/Rubbermaid-Access-Storage-Tote-Large/dp/B00BEUDXIG/

use filters to display variations and always use the canonical tag to point to the main URL.

Good luck!

Eliza

Hi Becky,

I would not create separate product URL if the size/color are the only variations in the product description. If you do this, you're risk creating duplicate content since there's not enough unique content for each page other than the title itself.

Create one page for the product, describe all relevant information for the user, and use filters to display the size and/or color variations.

Here's an example from Amazon and how they handle products with size/color variations:

http://www.amazon.com/Rubbermaid-Access-Storage-Tote-Large/dp/B00BEUDXIG/

use filters to display variations and always use the canonical tag to point to the main URL.

Good luck!

Eliza