How to link an image file to the upvote action in the q_man demo app

index.html.erb

<h1>Listing questions</h1>

<table>
  <tr>
    <th>Title</th>
    <th>Body</th>
    <th>Votes</th>
    <th>Upvote</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>

<% @questions.each do |question| %>
  <tr>
    <td><%= question.title %></td>
    <td><%= question.body %></td>
    <td><%= pluralize(question.votes.length, "vote") %></td>
    <td>
      <%=
        link_to votes_path(question_id: question.id), method: :post do
          image_tag "https://encrypted-tbn1.google.com/images?q=tbn:ANd9GcTNyeijtMLI2LEU1ly0wutumFX88JMaKDhWUsn7p0pR4Vf11IB2"
        end
      %>
    </td>
    <td><%= link_to 'Show', question %></td>
    <td><%= link_to 'Edit', edit_question_path(question) %></td>
    <td><%= link_to 'Destroy', question, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>
</table>

<br />

<%= link_to 'New Question', new_question_path %>