how to put description below image

how to put product description below image in products listing? now it can only be at the right of image.
And is it possible to change size of a little pictures in product page where additional images are shown?

You will have to edit the file "listing_img_desc" of the view "product" via the menu display->Views and change the display code for what you want to do.

For the thumbnails on the product page, you can do like that:
www.hikashop.com/en/support/documentatio...ling.html#thumbnails

nicolas, what exactly i need to change in listing_img_desc to make description below image?

It depends on how you want to do it.
Basically, moving the code related to the description, just after the code related to the image should be a good start.