Nice to hear something different! Bringing it Old School! The biggest problem is the strings, they just don't sound very real. In a string heavy track like this variations in expression are vital for "perceived realism", no amount of trickery with reverbs or anything like that will help I'm afraid. I'm not sure if anything but the expensive orchestral libraries have this unfortunately, but what you'd need ideally is the ability to control expression (intensity, vibratos etc) with automation or similar.