Hi,
1) Your images have a size of 150x93 forced.
It means that the image will always have this size and the HikaShop thumbnail generator will center the image (horizontally and vertically) if the image is too "smal".
There is no option to force the size and place the image at the bottom (top, left, or right) ; I added a feature request for the Helper Image but it won't be added in a short delay (HikaShop 2.3.5 is already full).
You have still the possibility to edit the HikaShop helper image yourself in order to add the feature but I will recommend you to not force the image size and use some CSS to place the image at the bottom.
2) The problem is in your template CSS for the rule:
.hikashop_subcontainer .hikashop_product_image .hikashop_product_image_subdiv a:before
3) The current overlay is related to your template, not to HikaShop ; so I can't tell you.
4) You need to modify your template CSS in order to apply a image transformation.
The only advice I can provide you is to check our "customize the display" documentation:
www.hikashop.com/support/support/documen...ize-the-display.html
Your customization will be CSS only and very specific ; it is not something we can provide in our support forum.
5) If you want to remove the pagination for just the module (and let the pagination for the rest) the easier will be to activate the module option : "Random items".
The parameter "show_limit" is link with the "random" one ; I'll discuss with Nicolas in order to know if the option "show limit" could be proposed in the module interface.
Regards,