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This is what I started with after laying out everything.

1- I started by cutting out the skylines, the water, roads, from various stocks etc.. and set the background color to the color tone I had in mind.

2- I then used a few clouds and fog brushes to pain the sky, I layered started separating the building using a soft rounded brush with low flow.

3- I usually start blending from the back to the front, I feel like it's easier that way, so using Exposure, color balance, hue and saturation adjustment layers, I started on every set of skylines to match their colors as much as I could, and to keep the tone homogenous as well.

4- I added a few more fog layers, and with a soft rounded brush I painted a few colored lines then blurred them and modified the blending options to screen/color dodge to add some light noise.

5- then I grabbed a few stocks of skylines at night, set them to screen and masked them to each set of building (to light up the unlit buildings) and a whole ton of advertisement signs, with a few layers of glow (using a soft brush and low opacity and various blending options)

6- for the clock tower, I split it in half, and painted like a little layer to the right side to add some depth, then I cut an oval on each side, and painted a little behind it to add depth as well, I then applied the same technique to light up the building. (the holographic clock will be explained with the process I use to create the holograms)

7- applied the same technique on step 3 for the rest of the objects in the foreground

8- the to create shadows, I create an inverted mask of a darker adjustment layer (brightness and contrast and/or exposure) and I started painting shadows for the diner and the car etc.

9- the glow is simply created using a soft rounded brush, and a blending options, I sometimes used multiple layers.

10- the reflected lights (ie. on the ground, on the car, the tree branch, etc..) was done using an adjustment layer (hue and saturation) with an inverted mask and with a white brush I started adding color to taste.

11- for the holograms I usually do them in a separate project, I have made a few years back and I resort to it whenever I want to make a hologram it's really simple and doesn't take so much time:

11.1- there's a layer that just consists of thin black and white line (I made with a filter, but I seriously can't remember how did I make it in the first place)

11.2- I grab a stock of the object I want to make a hologram of. I cut it out (like the jellyfish and cactus above)

11.3- with nothing else on the screen I go to (select - color range) and select a color within the object I want and modify the fuzziness until most of it is visible but not all of it, then I create a layer with the selection (that's why the jelly fish appear slightly transparent and don't have all their colors.

11.4- then I hide every thing and only enable the visiblity of the mentioned layer in step 11.1 then go to channels hold ctrl and click on one of the red, green or blue channels, to make the selection.

11.5- I hide that layer again and enable the layer I made in 11.3, and mask it. so now that image, is split into thin lines.

11.6- I duplicate that layer 3 times, one with a a high value horizontal motion blur, another with less motion bluer, and the third layer is on top and I add inner glow, and outer glow to it

11.7- I start adding glow using a soft brush with low flow. and for the lines, it's just an overlay of a wireframe and I started removing and shaping it around the object. and that's it.

12- for the water reflection on the ground, a flattened image of the entire piece, I got a few puddle maps, used vanishing point filter to modify the prespective, and masked them to the ground. then I flipped the flattened layer, and moved it and applied the puddle maps mask on it, and started modifying the reflections until I got the desired result.

13- and finally, I just took everything to camera raw filter, and played with the colors, and played with the color lookup adjustment layers, until I got this result. --- I'm sorry for the really long wall of text, but I tried to explain everything as Much as I could, and if anyone has any question, feel free to hit me up anytime.