How to make this aircraft more realistic?

This is rendered in cycles - what can help to make it more realistic?
If you know any better textures - can you please link me.

The edges at the wings are to sharp. The need a bevel.

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Try to use different surface imperfections maps. The one you used looks like clouds and for this kind of model, it doesn’t look like produced by human interaction. Try to use something that simulates a surface that was cleaned by human hands with directional smudges and maybe micro scratches.

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Better lighting will improve this right off the bat.

Beyond that, you need more actual geometry detail, and better textures.

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Visually I can’t distinguish whether this is a maned aircraft or unmanned drone due too indeterminate proportional editing however either way, surface imperfections (…weathering) will help sell a plausible intent for this object.

Check out some photos of the SR 71 if you haven’t used those for reference already.

In your image I find it a bit difficult to separate the aircraft from the floor in some areas. Perhaps that’s where the suggestions re lighting come from.