BASICALLY IT'S WHAT @
ANG TOLD YOU
Well, when it comes to Google images they basically look like they have same aspects as pages(web pages). The title tag and the keywords that are used on the page for instance influence the findability of the image you want to be found.
However, there are a two elements specifically that have more influence on the findability of the image, namely:
- The name of the image
- The alt tag
The image's name is basically the name of the image which you can give it. Let's say you want to rank wel in Google Images with a picture of yourself and your name is John Doe. You could upload an image to your webpage with a title like "IM000882.JPG". The problem here is that a name like this doesn't tell the bots that search your site anything about the image. An image name like "john-doe.JPG" will grant you a higher chance of getting found when someone types in "John Doe", since the Google bot now has a better understanding of what the picture is about thanks to the descriptive name.
The second element, the "alt tag", is more important than the previous one. The alt tag, short for alternate text tag, is basically text that can be attributed to an image in the source code. The alt tag was initially meant for visitors that can't see images on webpages, for instance because they turned of the option of viewing images in their browser. Instead of an image, they'll see the alt tag.
The text used in alt tags should be relevant to the image. At the same time it should also be as descriptive as possible. If for instance you have a black and white photograph of yourself, the alt tag should say something like "Black and white photograph of John Doe".
Even if you don't know anything about source codes or programming, alt tags should be fairly easy to implement. Here's how the above image + alt tag should look when implemented:
<img alt="Black and white photograph of John Doe "src="
www.yoursite.com/john-doe.JPG"/>
The text that is used on the page and specifically surrounding the image also influence the findability of the image. Use a few keywords for which you want to rank for in Google Images in a sentence of two surrounding the image (only if relevant of course, don't make it look like you're spamming).
Off-page aspects can also influence the ranking of your image. The amount of links from relevant websites to your image can give your image a boost in rankings, especially if the webpage is using a relevant keyword in the anchor text. If for instance there's a website that has a page with a link to your image with the anchor text "click here", you could send a suggestion per e-mail to the webmaster if they would kindly change the anchor text to "click here for a photograph of John Doe", so that their visitors know what they're going to see when they click on the link.