I'm working on a render and every time I render it as an image, using cycles, it's all lit up (which I don't want).
As you can see in the screenshot, the image is bright even without light sources!
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In your shaders, you shouldn't plug a texture directly into the "Material" output.
If you don't want your shader to emit light, but only to diffuse external light based on its color, then add a Diffuse shader.
PS: you can tell that a shader is probably wrong when there is a line between two differently-colored sockets. In your case, yellow ("color info") sockets were connected to green ("shader info") sockets.