Displaying an image

I am trying to display an image that is in my public/image folder and I
don't know how to.

What I want to do is to be able to assign a photo to an artist so you
can navigate through different artist's photo.

This is my image model

class Image < ActiveRecord::Base
  has_many :publishings
  has_many :artists, :through => :publishings
  has_many :comments,:through => :friends

  has_many :comments, :as => :resource, :class_name => "Commentable"

This is my image show.html

<p id="notice"><%= notice %></p>

  <%= @image.title %>

  <%= @image.filename %>

  <%= @image.likes %>

<%= link_to 'Edit', edit_image_path(@image) %> |
<%= link_to 'Back', images_path %>

Thanks in advance

You have has_many :comments twice.
For showing the image have a look at image_tag