Help with upscaling anime in Avisynth

[attackworld]

Hi, I am new to avisynth and I want to use it to upscale so SD anime. I really like the HD versions found in the Hentai OVAs forum, but I don't know what script to use.

This is the current script I am using, based on what I found elsewhere.

ffmpegsource2("")
Toon()
nnedi3_rpow2(2, cshift="Spline64Resize", fwidth=1280, fheight=720)
aWarpSharp(depth=10)
sharpen(0.2)
nnedi3_rpow2(2, cshift="Spline64Resize", fwidth=1280, fheight=720)
aWarpSharp(depth=10)
sharpen(0.2)
maa2 (mask=1, chroma=false, ss=2.0, aa=48, aac=40, threads=4, show=0)

However, it does not seem very "HD", and also some artifacts are visible now and then. Does anyone have a script that works wonders on SD anime?