You have several typos but the main part that matters the most is you haven't got the path to the image correct.
I'll give you a "major tip" here, rather than type the whole 3 lines of Doctype it would be easier to copy-and-paste one from an official source - even I don't type those out by hand.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
Since it is 'case sensitive' and if you compare this with your sample, it differs so change those three lines with my code here.
Then like we mentioned above the image is meant to reside in the same folder as your page in this case hence generically: <img src="example.png" alt="" /> you don't need to add the folder path since it is relative to the index.html file itself.
Therefore change your:
To the following:
<img src="divers-circle.jpg" class="feature" width="200" height="162"
alt="A circle of divers practice their skills"/>
I suspect you got confused with the folders and that index.html and divers-circle.jpg actually reside in a folder on your PC called "web-design". Since both files are already there you do NOT need add anything else - it's relative to itself.
It will now work assuming both those files are where they are supposed to be.