First image: implies that some people have lost their own personal meaning of discovery and rely on the meaning of others (as implied from using Google or other search engines on the computer).
Second image: conveys a meaning of discovery related to music and adolescence, possibly exercise too.
Third image: communicates that discovery is related to travelling the world, maybe making your own compass and finding your direction so to speak.
I had the same thought for the second and third image, but wow your interpretation for the first image was amazing
I thought of it as the discovery of how reliant we are on the internet in this era to answer questions that we should be able to answer ourselves
And I guess there is some irony in this image (if I'm not mistaken) because the man in the white robes seems to resemble a priest of some sort, thus he should be able to answer the question using his knowledge of the religion he follows because the meaning of life (to some extent) is dictated by our beliefs.
Other than that I want to commend you for that interpretation of the first image, it's sao deep