I picked "All Because of You" at random (well, sort of - Saliva have an amazing song with the same name, so it stood out). I love a good ballad, so really enjoyed it. The early parts of the song sound a bit bare and the strings that enter later sound too synthetic to my ears for the style. So, if I was tasked with finishing it off, I'd work with a good string library, introduce basic strings early, then build them up with the progression of the song.
Just my subjective opinion. I will probably listen more later, even if only out of interest and will comment here if I have something to say, which you can ignore or consider as you like.