Answered
How can I change a brush stroke after it is drawn?
I cannot make good pen lines with a thick stroke. It gets all out of wack. Is it possible to make my lines and change them afterwards?
If you have multiple brush strokes on the same transparent layer, then making a rough selection before using Free Transform will affect the selected stroke. Or you could use Shift Ctrl J to move a selected stroke to its own layer and transform it.
If you are using Windows, then Lazy Nezumi Pro is the single most important plugin for Photoshop. As well as have killer brush smoothing, it has more presets than you could count in a day. It is is super useful for drawing in perspective, for instance. A lot of professionals in companies like Disney use it for Inking rough line art.
If you are like me, and not the best at creating smooth flowing lines exactly where you want them, then another approach is to stroke a Workpath. Even people llike Bert Monroy use this trick. If you enable Simulate Pressure then you can create tapered lines this way.
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