Image markup is given by
<img src="source.jpg" id="myImg" style="height:200px;width:150px" />
Script to add validation for particular image element goes as below.
$(document).ready(function(){
if($("#myImg").css("display")!="none" && $("#myImg").css("visibility") !="hidden")
{
alert("Do stuff that are done after load of image");
}
else
{
alert("Do stuff those should be done before rendering of image");
}
});