Violin part for a song.

I have a few songs I am looking for a violin part to have on top of the instrumentation that is already there. Currently, there are several layers of cello but I'd love to hear something higher in the mix than is possible to achieve with a cello. I am uploading a song called "Sagittarius Summer". 1.) You'll hear the cello come in around the 1:22 mark. I'm not sure if it would be cool to have the violin come in shortly after to give it more of a creepy/sinister feel on top of what is already going on with that cello? (Specifically, at the 1:42 mark.) 2.) Around the 2:33 mark, you'll hear an abrupt guitar bust into the mix. This is our anti-guitar solo with a call and response thing going on with the cello parts. I'd love to hear the violin over the top just doubling what is already there. 3.) For the rest of the song (from the 3:11 mark to through to the end), I have no other ideas for violin. You'll hear what's going on and hopefully find some way to leave your musical fingerprint on the end.