You only need Smooth Style 2 and default Pony. It's important that you pass your base image through Img2Img multiple times instead of using a high denoising value. Use the following settings: DPM++ 3M SDE, CFG 6.5-7, Denoise 0.35-0.5, Steps 25-30.
The crop of your base image has to be square so you can use a resolution of exactly 1024x1024. Pass it through Img2Img with a random seed, then take the output and put it through Img2Img again. Do that about 4 times and it should match the style pretty closely.