Hi,
1. To hide the "magnifying glass on the images" just add this css code in to the bottom of your template css file:
#pb-right-column #image-block #view_full_size .span_link {display: none !important;}
Or you can open /themes/ot_jewelry/css/product.css and edit it in about line 29.
2. Image thumbnail size. If you don't want it to be square, open /themes/ot_jewelry/css/product.css and in about line 19, find this:
#pb-right-column #image-block img {
border: 1px solid #CDCDCD;
width: 335px;
}
change to:
#pb-right-column #image-block img {
border: 1px solid #CDCDCD;
max-width: 335px;
width: auto;
height: auto;
}
Save it and clear browser cache and see.
Thanks