caja1 {background-image:url(Imagenes de fondo/Interrogación.jpg);background-repeat:no-repeat;background-position:bottom left;}
caja2 {background-image:url(Imagenes de fondo/Interrogación.jpg);background-repeat:no-repeat;background-position:right top;}
caja3 {background-image:url(Imagenes de fondo/Interrogación.jpg);background-repeat:no-repeat;background-position:50% 50%;}
<body>
<div id="caja1"><h1>bottom left</h1></div>
<div id="caja2"><h1>right top</h1></div>
<div id="caja3"><h1>50% 50%</h1></div>
</body>
<body>
<div id="caja1"><h1>bottom left</h1></div>
<div id="caja2"><h1>right top</h1></div>
<div id="caja3"><h1>50% 50%</h1></div>
</body>
div {display:inline-block;}
#caja1 {background-image:url("Imagenes de fondo/Interrogación.jpg");background-repeat:no-repeat;background-position:bottom left;width:165px;height:300px;border:1px solid black;margin-left:15px;margin-right:14px;}
#caja2 {background-image:url("Imagenes de fondo/Interrogación.jpg");background-repeat:no-repeat;background-position:right top;width:165px;height:300px;border:1px solid black;margin-left:14px;margin-right:14px;}
#caja3 {background-image:url("Imagenes de fondo/Interrogación.jpg");background-repeat:no-repeat;background-position:50% 50%;width:165px;height:300px;border:1px solid black;margin-left:14px;}