Play with the level of detail when using this effect. Creating more elements will lead to more realism. Adding more variations (e.g. a gradual change of colour, more elaborate swirls and refined blurs, the closer you get to the real thing.
I made two quick variations of the first scene. Playing around with the gradients and colouring the top of a ‘light shape’ in pink while the bottom is a blueish tone. Seeing the layer is set to ‘Screen’, it works best if you keep the shades light.