Isolation door with no improvement — why?

[Tlepsh]

Hello,

I recently installed an isolation door for the main entrance of my studio:

So far, the isolation performance compared to the previous basic wooden door is pretty similar, which tells me there’s still more work to do.
At this point, I’ve filled parts of the frame with foam:

However, there are still some visible gaps where you can see through to the other side, like this:

There’s also a plastic seal at the bottom that should help reduce sound leakage:

Before I go ahead and fill the remaining gaps with more foam, I wanted to get some input from people with more experience. The results so far haven’t been what I was hoping for, and I’m wondering if the remaining gaps are the main issue or if I might be overlooking something else.

Any advice or suggestions would be greatly appreciated.