I just show my previously finished client work and that's pretty much it, people just say "I like that one" or "I want mountains like this one and colors like that one".

I don't see a significant difference between 2 and 3. 1 and the others, sure (not shaded versus shaded with more detailed terrain) but if I were shopping I don't think it would be quite clear to me what defines 'quite fancy' to you. I don't think it's a strong enough distinction even though it may feel like a huge difference to you as an artist.