Also choose the image format to use on your website wisely. Use the gif format for extremely basic 256 colours or less graphics, then jpeg. Only use PNG if you have no choice and stay clear of BMP.
Make sure the image filename actually relates to the image itself, rather than some random filename. Plus once embedded into the website make sure you used ‘alt tags’ and when possbiy added a ‘caption’ to accompany the image.
In the past and often still today people will not properly create website links for search engine optimisation. Instead of using ‘for more info:<link>click here<link>’ or similar, you could use for further reading see <link>keyword 1 keyword 2<link>‘.
Making your keywords part of the link will help increase the relevancy in the eyes of search engines to the page being linked to.