The starting photo.

Added a desaturation layer, shifting the hue to a dark blue to leave some warmer tones.

Next I increased the contrast and gave some soft light to the piece by slightly increasing the brightness.

I increased the exposure & offset here.

Then I added a scratched up texture, lowered the opacity, and changed the texture's blend mode to "difference."

I decided that I wanted to push the scratches further so added another warped layer of texture & set this one to have Linear Dodge & give some white scratches. 

The final touch was to go back and switch the contrast adjustment layer to have a soft light blend mode, which really pulled together that faded blurry white look on the skin for a daguerreotype.

This is the starting image for the second photo. This time we're going for Rococo.

The first step is to hue shift slightly to blue to bring out those greenish floral tones, tip the lightness forward to fade into a pastel-like ethereal tone, and increase the saturation for more vibrant colors.

Here I filtered in noise to add a grainy texture.

The next step was to filter a stylized brush texture.

Then I added a vibrance adjustment layer and set the blend mode to lighter color. 

Finally, I added some increased exposure offset and set the layer to Lighten.

Here is the original photo for our post-apocalyptic transition.

The first step is to tone down the saturation and hue shift to an orange rusty color with an adjustment layer. Then, we tone down the lightness and set that layer to an overlay.

Then I got a contrast adjustment layer and set it to multiply. Lowering the brightness and increasing the contrast should increase the tension in those values and add some drama.

Pushing the drama a bit more, I add another hue/saturation layer and set it to a hard light blend mode. Then, I desaturated the colors some to fade out the orange and go for a more bleak tone. 

The next step was to add a texture and hue shift it to green.

The final step was to give a noise filter over that the piece to roughen the piece up more and break up that green transition.

Here is the start of our custom stylization. 

We're going to hue shift here and set the blend mode to divide and really splash out with some neon colors.

Next we take that half and make it more vibrant with a vibrancy adjustment layer, then it is set to linear light to give a blocky cell-shaded look.

Then we're going to add a solarize style and set it to multiply at about %49 opacity.

Next we will select the color of the negative space and use a hue adjustment layer with vivid light to give some contrasting blocks of color.

Then lowering the contrast and increasing brightness with a screen mode will allow use to unify the harsh tones somewhat.

This is the start of our vaporwave style

Here we change the color balance with an adjustment layer and set it to exclusion.

Then we have to boost both the brightness and contrast with another adjustment layer and set the mode to pin light.

Lastly, we add an exposure adjustment layer to increase exposure, lower offset, and change the gamma correction.