Sorry for the delay. I am on the east coast and I turned in for the night.
Once you involved the criminal justice
system in your marital disputes and the police turned the file over to the DA, the case ceased to become yours and belongs to the DA who can prosecute whether you and your husband wish to go forward or not. The pictures would be evidence of some contact between you. But even if there were none, your voice on the 911 tape reporting the incident would be enough for them to prosecute if they found the contents of the tape believable.
The reason I think they may not is that your statement makes you and not your husband the aggressor in a domestic assault. And your husband, when contacted, wisely chooses not to make any statements to the police. That means you've established a possible self-defense claim for him, which would, if believed by the trier of fact, ultimately exonorate him completely.
Then too, the pictures of the injuries could possibly be seen as inconsistent with your testiimony that he choked you. The bruising is on your arm and not around your throat. A small scratch on your chin and neck, while certainly evidence that something occurred, does not suggest a choking.
So it looks to me that the state actually has a better case against you than against him, but that because of your injuries they would be unlikely to arrest just one of you but both or none.
I obviously cannot predict the future. Do they have enough to arrest you and/or your husband? Absolutely. They had that the moment you reported the assault to 911. That's all they need for an arrest. But for a conviction, they are required to present enough evidence to prove their case beyond a reasonable doubt, and with two reluctant complainants and no real harm done, they may not find it worth the state's time.