Upgraded version at: https://openmodeldb.info/models/4x-FaceUpSharpDAT

Description: A 4x face photo upscaler trained on the FaceUp dataset. These models are improvements over and successors to the previously released 4xFFHQDAT. This model comes in 4 different versions: 4xFaceUpDAT (for high-quality inputs) 4xFaceUpLDAT (for lower-quality inputs, can perform extra denoising) 4xFaceUpSharpDAT (for high-quality inputs, produces sharper outputs, trained without USM but with sharp input images, for high-quality inputs) 4xFaceUpSharpLDAT (for lower-quality inputs, produces sharper outputs, trained without USM but with sharp input images, can perform extra denoising)

I recommend giving 4xFaceUpDAT a try.

A 4x face photo upscaler supporting OTF jpg compression, blur, and scaling, trained on the FFHQ dataset. This tool has been trained on faces, but I think it can also be used for other photos, as it may help preserve skin details. This is not face restoration, but a 4x upscaler trained on a face dataset. Therefore, if you want to achieve good output quality, the input image must be of good quality.