Use the options directly in image tag as how you use in html tag,but little convertion has to be done for Rails code, it will work
HTML : <img alt="logo" src="logo.png" align="right" style="background-color:#288AC6; padding:10px;" class="classname" id="idname" />
RAILS : <%= image_tag('logo.png', :alt=>'logo',:align=>'right' ,:style=>'background-color:##288AC6; padding:10px;' ,:class=>"classname" , :id=>"idname") %>
Just make the attribute name in HTML as symbols followed by a value as a key value pair
align = "left" HTML :align => "left" RAILS
-Karthikeyan Railsfactory