My Cacti

Just wanted some advice from experts. My son brought me these back from Tenerife about 3 years ago. The one on the left opens up in the sun which was shining briefly but has now disappeared then the flowers die off. The middle one is only spiky and the one on the right produces 2 flowers which die.The one showing flowered when l first got it and it is still there like an everlasting one.l wonder why the others didn't do the same? The second blip is a replacement snail. It hid before l took its photo.My original one was vanished into thin air :-(. I don't know why the photo is blue.l took it with my tablet not that l was taking a tablet but maybe need to now :-(