Fanis V,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#pic{
box-sizing:border-box;
border: 1px solid #0000FF;
height:200px;
width:300px;
margin: 0; padding: 0;
background-image: url(http://vremena-goda.su/uploads/posts/2015-12/thumbs/1450868041_begemot-foto-i-opisanie.jpg);
background-repeat: no-repeat;
background-size: cover;
}
#cb1:checked ~ #pic{
background-image: url(http://vremena-goda.su/uploads/posts/2015-12/thumbs/1450868041_begemot-foto-i-opisanie.jpg);
}
#cb2:checked ~ #pic{
background-image: url(http://zhivotnue.ru/image/dicie_zhivotnue/slonovue/4.jpg);
}
#cb3:checked ~ #pic{
background-image: url(https://dncache-mauganscorp.netdna-ssl.com/thumbseg/2150/2150535-bigthumbnail.jpg);
}
</style>
</head>
<body>
<input checked="checked" autocomplete="off" type ="radio" id = "cb1" name="show" >
<input autocomplete="off" type ="radio" id = "cb2" name="show">
<input autocomplete="off" type ="radio" id = "cb3" name="show">
<div id="pic"></div>
</body>
</html>