So it appears Amaterasu was not just a one time thing for Sasuke, and also he can control it where as it was instigated by the appaerance of Madara's face previously.
The fact that sasukes eye did not revert to Itachi's MS shape when he activated the technique, does this mean he actually has unlocked the potential to discover EMS through his eyes, but as of yet has no idea how to control them? Also was the bleeding eye a constant with the use of amaterasu? we only see Itachi using it once against sasuke when we see his eyes as opposed to the incident with Jiraiya where we see the burning black flames in the frogs stomach
With everything that was going on during Itachi's last battle i assumed the bleeding eye was a result of overuse and blindess with MS. But it appears to be just a cool effect that happens when using amaterasu.
My last point is, if sasuke has the potential for EMS by recieving his brothers blood in his eye without having taken itachis eyes, i think this means he will still be succeptable to blindness unlike Madara. With the usage of his brothers MS techniques and his own MS techniques on top of the EMS technique born from the two sets of MS This could rapidly accelerate Sasukes decent into darkness within the timeframe that appears to be left in the manga.