Ok, now I have to find this movie. It looks like a mexican remake of Plan 9.
I've only seen the Santo vs Zombies film, where Lorena Velazquez has a part. It's on youtube in a pretty good quality. I don't know any Spanish, but I'm not sure if you have to. It just makes the film more strange and dreamlike. I'm not sure which film the space alien from the second photo is in. I'm sure it's amazing.
According to my research, it is "Nave de los Monstruos", a 1960 movie. It's also on youtube. I'll try to watch one, my days are in cruel lack of spanish monsters.