not sure if it's down to PP or a defective lens but IMO the centre of the image is too bright or the vignetting effect is too strong.
Looks like a great morning seeing the deer but the IQ is very poor IMO
I wouldn't say the IQ is *very* poor, but it could definitely be better.
The first and fourth photos have a different, more yellow colour tint to the 2nd and 3rd, which are slightly more greeny.
The centre of each image is really lacking punch, they need more contrast/clarity particularly to make the deer stand out against the background. I think that the fact that the image is darker and more contrasty around the edges just accentuates the lack of contrast in the centre.
If the original image is ok (ie it's not a problem with the lens), I would turn down the vignette and increase the contrast and clarity a bit at a time until it looks sharper.
Try that out and then compare with these versions to see which looks better and which you prefer.
That said, as photographer and creator of the image, it's up to you how you want it to look.