Simple adjustments of contrast, highlights, shadows, and exposure can have a huge impact on the final image. Combine this with skin editing and other specialties the app may offer can result in a huge transformation from the original image. The firs image is a raw unedited photo and the second is after editing to skin, and other manipulations of shadows, contrast, and highlights. It has a dramatic impact on the mood the photo is trying convey. Final result looks more like what a professional photographer would give a client.