Time to review the Spanish songs.
1. Barei - "Say Yay!": that tragic accent

but apart from that, great voice and catchy song. Production is pretty weak, they need to work on it a bit. The song needs more drums or an EDM breakdown after the chorus. Top 20 max.
2. Electric Nana - "Now": cute song, with a catchy and powerful chorus. Lacks the wow factor, can't see it beyond the top 20.
3. María Isabel - "La vida sólo es una": bookmark me, this would NOT do well at the contest. Qué me quiten lo bailao teas. Totally not catchy.
4. Maverick - "Un mundo más feliz": if Spain was in the semi-final, this song would come last. If they pick it for the Eurovision (they'd never), they have last place on lock. Tragic.
5. Salvador Beltrán - "Días de alegría": hot voice, relaxing song with a summery vibe, I can see it in the top 15.
6. Xuso Jones - "Victorious": I can see it in the top 10, it kinda reminds me of Heroes even though they don't sound alike. It would be better if it was all in English.
In conclusion: Xuso Jones or be ready to flop.
I've also listened to Iceland's songs and they're all pretty boring. All weakly produced, can't even remember one of them... their language is one of the worst for singing so I guess I'll wait and see if they make an English version of the winning song.