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What you need to be looking at is tutorials that talk about blending modes and about blending layers.

I suspect what has been done here (and actually not in a particularly expert way! - I say that to say how straightforward the process is rather than to diminish the effect of the design. Sometimes a simple process can produce elegant solutions) is that an underlying layer has been blended with a top layer.

If you zoom right in on this poster you will see that the main characters facial designs are actually elements showing through from the ship underneath.

I dont know how well you know Photoshop but what has happened here is that the character has been placed on a layer either above or below the image of the ship and then blending modes and / masking have been used to let the "design" from the ship show through to the face.

If you know about layers, masks etc. and blending modes but still need more info then let me know.