As we're using font awesome as external library, it'll be good idea to use existing font awesome icon.
Identify all the resource that can be replace with equivalent HTML+CSS code and convert by utlizing Font-awesome library.
Some images that can be replace.
1.) Sign in with Google.
2.) Social media icons in footer.
A square block element can be created [with HTML] and icons can be positioned. List of icons that can be used are :-
http://fontawesome.io/icon/facebook/
http://fontawesome.io/icon/youtube-play/
http://fontawesome.io/3.2.1/icon/google-plus/
http://fontawesome.io/icon/twitter/