adjust list items size

Is there a setting to adjust the list items size.
Make the photos smaller and decrease the space between items for sale.

If you are on about the ProductOverview list/grid ??

You can decrease the size of the image through

admin-setting-media settings-Product Thumbnail Image size (catalog)

With the space between the list I think you can alter the following line in the CSS highlighted in bold. Not 100% but worth testing that part....

.product-list .item-box{text-align:left;clear:both;position:relative;margin-bottom:10px;}

I hope this helps

Rich

Thanks. I will look into what your suggest.

I realize my question may not have been very clear.
My main purpose is to get more item on a page by making the listing height less and the picture smaller.

you can specify the thumbnail dimension in admin area, global settings->media