Hello,
To change image on furniture home page go to Pages > edit this page > scroll down to the row with that image and just change background, see http://prntscr.com/bptppd.
Unfortunately, at present there is no option to use different breadcrumbs images for every product category, only 1 common image for the shop page and all the product categories, single products. To do this go to Pages > edit Shop page and upload featured image.
Regards