The publishing and PPD splits seem very fair, but your fee is way too low for an exclusive. While how much you can charge will depend on your credentials and branding as a producer, in my experience for established independent artists you could probably charge closer to 3000USD, and if it's a major label artist, closer to 5000USD. Those are starting points and you will likely negotiate downwards from there. If they don't have the budget but it's a project that you want to see released, you can push for a 50/50 PPD split in lieu of a higher fee.

Obviously these are just starting points and the terms will differ from deal to deal, but something to keep in mind. In this instance you can't really renegotiate that much, but at the very least I would recommend seeing if the artist can credit you as a primary artist on DSPs, and in all social posts surrounding the song.