Just to clear up a misunderstanding....
You do not show 3 actual hard drives in the Disk Utility window.
There's your hard drive (the one beginning with Apple HDD...), and then your hard drive boot volume (yours is named "Untitled"). That is where everything is stored, and that's where your operating system is installed.
The other two items in the list (Apple Disk Image..., and OS X Base System ...) are not on your hard drive, but is part of the internet recovery system that you are using. The Apple Disk Image, and its mounted OS X Base Image are created as virtual drives whenever you boot to Internet recovery.
Just so you understand, Internet Recovery is booting to an image that exists only on Apple's servers. It is not in any way directly accessible to you. The image is only used for booting, and disappears when you shut down. They appear in your Disk Utility, because your Mac is using them for the booting system, but are only temporary, and don't take up any space on your hard drive. So, for your purposes, they can be completely ignored. The only drive that is relevant to you is the one named "Untitled". That's where your files are located.
And, according to your various pictures - the "Untitled" volume appears to be completely full. That can mean that the drive has FileVault turned on, meaning that the volume is fully encrypted with Apple's File Vault. You may not be able to do anything about that, unless you know the unlocking password (which is not required to be the same as the account login, or admin password), and the simplest way to get more space will probably be to erase the drive, and reinstall the system.