Best way to include image_tag inside link_to
You could create a helper to keep your views less bloated. For example:

app/helpers/application_helper.rb

...
def image_link_to(image_path, url, image_tag_options = { }, link_to_options = { })
  link_to url, link_to_options do
    image_tag image_path, image_tag_options
  end
end
...


app/views/pages/show.html.haml

...
= image_link_to "buckminsterfullerene.png", my_url_helper, { size: '210x60', alt: 'Molecular structure of Buckminsterfullerene' }, { title: 'Buckminsterfullerene', rel: 'tooltip', relative: true }
...