Change look of WooCommerce Store

I would like to change the look of my online store and the way in which the images look. Basically as you can see in Pic1, only 2 images are shown when the side bar is there. I want the images to be smaller so I can fit 3 or 4 images instead. The images are also cropped weirdly. The other issues I am having is when you go to mobile view the side bar is at the bottom of everything and the buttons look funny (see pic 2). I want to work with somebody to clean everything up so it looks great. Thanks Anthony