>>15118Oof... okay...
first step, mydude, download GIMP, current stable version 2.10.22. I know it ain't mainstream, but it's all I've ever used, so it's what I know.
Step number "B": Open file you wanna modify. Quickest and dirtiest way to "plump-da-bunz": select "Filters"->"Distort"->"IWarp", and you can just click and drag (via "Move" selection) the curves where you want them. May take some fiddling with "Deform Radius" before you're moving the meat the way you want...
Step option 'tres'... free-select tool. Use it to (as neatly as-fookin-possible) select the curve you've just modified, then press Ctrl-c to copy it, making sure you select back into an un-modified area for reference (also, you'll probably want to set line-guides to zero... they just get in the way). Then you'll press Ctrl-z to undo the warp (probably multiple times) until you're back to the raw image, and then Ctrl-v to paste, and then moving it back into alignment. This will result in your modified curves, without the background stretching that makes it plainly obvious. A quick hit with the blur tool may be necessary...
Expect to spend many hours at this. HMU if you have further questions. This is a simplistic as I could make it. There's many advanced tools/techniques. It definitely takes an artist's eye, which I so did not ten years ago (and only barely have now...). Good luck, mang...