How to 'mix' textures in with one another?

[TheBlenderSnack]

Greetings! I’m a motion graphics artist trying to learn how to use Blender, mainly so that I can use it with After Effects.

I’m doing a rebranding project for a client, and they have requested that I create a custom iPhone design and I have this set up:
http://prntscr.com/jdh8yw

I want to mix an image texture somewhere in there but keep the Apple logo + glossy reflection on the phone.

https://imgur.com/jeISC6E

Preferably, I’d like to be able to use the UV Image Editor to align the decal properly on the phone.

Thanks in advance!

[Blujay]

So you want the apple logo on top of the image texture which is supposed to be the design on the phone?
I’m not the best at texturing but I’m pretty sure there are several ways to go about this.
If the apple logo is a texture with a transparent background, you could use the alpha channel to put in on top of the image texture something like this:
I’m just using a glossy shader for this example, you can plug this into whatever node setup you have.
Here’s the original only material with no image texture, just a glossy shader.

And here is the material with the textures on top of each other, each controlled with its own UV map.

This is the node setup:

Alternatively, you could just combine the images and plug it into the color for the gloss.
Hopefully that helps.