Let's have a look...

I see a
Real Madrid - Liverpool semi final draw already there.

Nobody to stop Liverpool until then. PSG destroyed Brest but we are talking about Liverpool here. PSG aren't strong enough to eliminate them surprisingly.
On the other side, I believe the semi final matchup would be
Barcelona - Inter. It would be such a tough one to predict. I don't want to underestimate Inter. I assume Barcelona would make it by close margin then.
And an El Clasico in the finale... This is my prediction for now.

that's a very good prediction my friend yes of course I am also sure that Liverpool will definitely have the potential to win against PSG but of course the competition will be fierce in that match and of course in the end I am also sure that Liverpool will qualify for the last 8. if you look at the Atletico Madrid match against Real Madrid of course I am sure Real Madrid will be able to win against Atletico Madrid and I am sure Real Madrid will qualify for the last 8. but after that if Real Madrid wins again against Liverpool of course Real Madrid will be able to advance to the final and yes it could happen as you predicted.
but of course if for example the El Clasico match occurs in the final of course this will be very interesting because the El Clasico match always competes tightly especially in the Champions League wow this will definitely be a more exciting and prestigious match. but of course we'll just see later and what is certain in the UCL all the teams are very strong and of course we won't know what will happen later because surprises could occur in the UCL matches and it could be that the team that is not favored will win. yes now let's just see if your prediction will come true or not.