The new bass is a big improvement. I'd pull it back a little (~3 dB) in the mix, though.
Another thing I'd do is let the piano carry the intro and first verse alone, holding back the strings until "a picture to remember...". I'd also consider thinning the strings out at first, perhaps with just a cello coming in initially and gradually widening the chords as the song progresses.
Song dynamics are a challenge with minimal instrumentation, so you have to figure out ways to let the tune build. Regardless of how you address it, though, it's still gonna be a darn fine tune.