<h1><%= t ".heading", :name => @trace.name %></h1>
<% end %>
-<img src="<%= url_for :controller => "traces", :action => "picture", :id => @trace.id, :display_name => @trace.user.display_name %>">
+<%= image_tag trace_picture_path(@trace.user, @trace), :class => "trace_image" %>
<%= bootstrap_form_for @trace do |f| %>
<%= f.text_field :name, :disabled => true %>