Can I access pictures stored inside iCloud (from Apple)?
Only Apple own devices can access iCloud content. It is not a Pix-Star issue it's the same for everyone.
We really also would like to support this iCloud service… as we do for other providers (Facebook, Google Plus, Skydrive, Dropbox...)
We are very sorry we can't do anything here to solve this situation, we need to wait for Apple to change their policy and open up their service to others.