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Might I suggest also sharing this on Knockout?
It is the successor to the Facepunch Studios forum where a great deal
of the Source modding community used to congregate. I'm sure you could get a lot of
great feedback from this thread.
When editing textures, try to make them line up with the existing sprite as best you can. Then, get rid of the existing sprite and keep the new one (assuming they're on separate layers). You want to do this so you can prevent cropping issues with the texture, since anything too much outside the range will get cut off. -EpicJake72 in his modding guide.
Of course, I can explain you how to remove sprite clipping for those sprites later, though.