I used to see F-18's going around like this when I used to live in Hampton, Virginia. So it's really not that far off from being realistic. If anything is off it's the lighting on the jet when compared to the background clouds. (Darker perhaps?) They look smallish in photos too. It wouldn't hurt to use a hint of a dark exhaust trail. I think it could be better composition-wise. (If you're going to have the jet, why not make it the subject and get in closer?)

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.