That looks like a great route. We did a similar one (but in the other direction) 2 years ago. Some random thoughts
Argeles is nice.
The trip up to Cirque du Gavarnie is worth it and there's a campsite so you can enjoy the cirque in the morning before the coaches of tourists start to arrive
You are currently missing Col d'Aspin, which was my favourite of all the cols we went over.
Tarascon dur Ariege has a great campsite.
Might be worth heading a bit further north on the final bit to check out the Cathar castles?
That looks like a great route. We did a similar one (but in the other direction) 2 years ago. Some random thoughts
Argeles is nice.
The trip up to Cirque du Gavarnie is worth it and there's a campsite so you can enjoy the cirque in the morning before the coaches of tourists start to arrive
You are currently missing Col d'Aspin, which was my favourite of all the cols we went over.
Tarascon dur Ariege has a great campsite.
Might be worth heading a bit further north on the final bit to check out the Cathar castles?