The dataset was remade with a total of 197 images (see training data for image list). The only tag was "norman rockwell". A weight of 0.9 works well and upscaling gives better results. Only tested with base Illustrious-XL v0.1 model.
Most common bucket sizes: 960x1024 (44), 896x1088 (43), 896x1152 (40)