What is best pratice ?

Should i use as many tags as possible to "label" my content - aside, article if i dont need it to style the page.

I was thinking i dont need the <figure> tag to style the image or anything, and it just take up space. Or is it a good way to tell google about my content ?

Like using :

HTML Code:
  <img src="/orang-utan.jpg" alt="Baby Orang Utan hanging from a rope">