I have 2 Questions

[AlexanderWhite]

1. what if we do the interlinking on the exact keywords? Is this comes under spam technique?

For example - http://blog.payscout.com/automotive-merchant-services/

I interlink the exact keyword in the above URL.

2. Can we use same image 2-3 times on the same website with different anchor tags?

For example -

http://packforcity.com/what-to-wear-in-new-orleans-in-january/

http://packforcity.com/what-to-wear-in-san-francisco-in-october/

Same image used on the website with different alt tag.

[JaneCopland]

Linking internally with optimised anchor text should be fine, but be careful not to overdo this in the same manner that you would not overdo inbound links with optimised anchors.

In the last day, I've read a couple of theories about over-done internal anchor text being a common factor in sites that have recently lost rankings, but do NOT take that as gospel or even particularly important yet, as this was acknowledged by the person who said it as a very preliminary theory that they had not run proper analysis on yet. Just something to keep an eye on - I am sure the person will publish this theory if they establish that it has more merit!

The image re-usage should be fine, although it's best to use entirely unique content in both text and imagery.

[evan89]

I agree with both of these gentlemen (Kevin and Richard). It is easy to get in the mindset of optimization, and forget natural. When naming images, and even titles, just be careful to keep the user experience first, and optimization second. Search engines are motivated to serve the user experience, so you should as well.

[kwoolf]

Yep, Richard is right about the anchor text in your link having the exact same keyword phrase as your URL. You could take that one step further and name your image automotive-merchant-services.jpg.

With that in mind, posting an image on the same site multiple times with different alt, title and anchor text might not be what you want to do, depending of course on how your articles or products are posted. I would actually have multiple versions of the image and rename them as mentioned above, especial since these images will appear for completely different articles. Site performance issues would be minimal compared to the SEO benefits.

[TheeDigital]

1.  I would call this a best practice, not spam.

2.  Probably won't hurt, but not really a best practice.  Check out http://blog.maxcdn.com/better-image-seo-canonical-headers/ explaining using images multiple times and canonical headers to point to the original source.  I also see no problem with different alt texts.