Your rendering is great, I would add some rim lighting to get Spidey to pop more but the color picks are good. There's a building there that is yellow for some reason, lol.
When you do buildings, usually, they should fall into the background with a cooler color, or atleast inherit the background's cool color. Usually you'll see stuff in the distance as blue-ish. On this case, you could go with purple. a light purple. And by coloring the lineart of those buildings, they could really fall back into the background and bring out the focal character.
WHAT! REALLY!!!??? Okay I know this may sound silly but I put other people's artwork as my screensaver on my cell all the time and I've always wondered if someone would actually do that to mine. AWE!!! I'm so honored!!! Thank you!!!