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Tried to make some versions of the Waterfall Cave eyecatch for the different time cycles. There's no lighting differences between them because based on how things were done in HGSS, official cave eyecatches don't show any lighting changes from morning to night except in cases where the sky is visible from within the eyecatch (such as Mt. Moon and Mt. Mortar). Things like Dark Cave, Slowpoke Well, and even places like Victory Road and Ruins of Alph where the light from outside is visible all stay the same throughout.
Although Koblin is listed as by far the most common encounter in the cave (40%) and Pebblosa as another fairly common one (25%) I went with Pengliff, Bluffin, and Capig because I feel the aforementioned two Pokémon fit better in the Coal Mine's eyecatches. And in the case of Capig although it only has a 4% appearance rate I included it in this one since it likely wouldn't be appearing in any other eyecatch.
For Bluffin instead of having it creepily peeking out from behind the rock I could have it in the background area to its right.