If only selecting/deselecting of the checkbox is your requirement then what I would suggest is :
Step 1: Place the image and the checkbox inside a block (may it be a div or table)
Step 2: Provide that block relative position with some specific height and width.
Step 3: For checkbox, give it absolute position and set the right and bottom gaps (based on your requirement).
For instance, the code should look like this
<div class="img_block">
<img src="image-path" alt="" />
<input type="checkbox" class="chkbox" />
</div>
<div class="img_block">
<img src="image-path" alt="" />
<input type="checkbox" class="chkbox" />
</div>
And the css for the same is
.img_block {
position: relative;
width: 230px;
margin-right: 20px;
margin-bottom: 10px;
height: 30px;
}
.chkbox {
position: absolute;
right: 5px;
bottom: 3px;
}
I hope this suits your requirement.