Blender 3D: Characters, Machines, and Scenes for Artists

Adding detail in an Image Editor

I recommend saving your various baked renders as separate images, and then combining them in a 2D Image Editor that supports layers (such as GIMP, Photoshop, and so on.).

Once you've combined them together in a way that you like, you can also go through and manually paint highlights, shadows, and decals onto your texture map.

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For instance, I've quickly painted a basic tread pattern onto the tire:

This doesn't look particularly realistic (as a tread pattern), but it's just an example. You can easily find real tread patterns online or paint your own.

Another thing you can do is take photographs ...