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Technically they are ok, but you might consider using a smaller aperture to increase the depth of field. In terms of post-processing, careful sharpening and sometimes boosting the mid-tone contrast can help add snag, especially when the lighting is low in contrast as it is here.
In terms of conventional art, flat lighting can make an image a bit dull. Centering the subject is often not the best position, in terms of image composition.
Here are a couple of illustrations of what you can do better in camera, but can mimic in PP.
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