I don't have pictures, but... Based on what I
can see, this is what could happen:
Your rooster has a plumage very similar to a Coronation Sussex. Light Sussex are silver-based, so Coronation Sussex are probably also Silver-based. LS are used alot to create sex-linked offsprings.
Silver is dominant to Gold in sex-linkage (though cockerels can be silver yet display gold leakage). Put a silver rooster over a red hen and all chicks will be silver. Put a gold rooster over a silver hen, and you get red pullets & white cockerels (who often have some gold too, but are mainly silver.)
This means your rooster's possible parentage is a red, wheaten or blue wheaten Ameraucana dad over a Light or Coronation Sussex. His sisters would be Gold, and his brothers would be Silver.
Speckled Sussex are gold-based, and your rooster is possibly silver-based. If you mate them together, all of their chicks could be silver like their father. I'm not sure if they would be mottled, as that is a recessive gene and needs two copies to manifest on chicken plumage. The speckles of your hen will only show in her babies if your rooster carries them too. He doesn't seem to have them, from what I can see.
I'm no chicken expert when it comes to plumage, but that is one of many possibilities for the results of your chicken mating. The rooster IS an EE, I could be completely wrong with his parentage and it would be hard to tell. Best way to know is to hatch some eggs and see what the chicks grow up to be.