If all images and software aren't loading in the software app delete the ubuntu-reviews.db file at
~/.local/share/gnome-software/ubuntu-reviews.db. It will be recreated automatically the next time you open Ubuntu Software. Open the terminal and type:
mkdir -p ~/.local/share/gnome-software/
mv ubuntu-reviews.db ubuntu-reviews.db.bak # skip if ubuntu-reviews.db doesn't exist
Then reopen Ubuntu Software.
If it still doesn't work you could try reinstalling Ubuntu Software.
sudo apt update
sudo apt purge gnome-software
sudo apt install gnome-software