For ALL the images on the site are here:
assets/images/
Services (images):
assets/images/services
Bathroom (image):
assets/images/bathroom.png
assets/lib/front_ajax.php - Line 904
Bed (image):
assets/images/bed.png
assets/lib/front_ajax.php - Line 897
Admin Login (image):
assets/images/login-bg.png
assets/images/login-bg-1.png
Add-ons (images):
/assets/images/addons-images/