You did that all freehand- I don't have those artistic superpowers.
I am an old guy who can't see all that well anymore and my hands are not as steady as they used to be. I do not get perfect results, but prefect results were rarely, if ever, offered on the original machines.
I followed a groove in the fenders to get the fender striping done. Had to wipe off a mistake or two, and then resume. There is tons of room for error, if you correct the situation soon enough, which, put another way, is immediately.
The rings on the stays, fork blades and seat tube are automotive decorative tape in varying widths. Ensure cleanliness, apply with care and seal the ends with a touch of clear nail polish. This might not be permanent, but it is easy to change and does a good job of hiding the transition line between color and chrome plated surfaces.
It is inexpensive and repairable, for little or no cost, if the tape ever does fail...