So, context: it's going to be a design I'm uploading to Redbubble. On Redbubble, buyers can change the background colour on t-shirts, but not on any other products. On other products I set the background colour, and stickers always have a white border around them.

Alright, I'm now considering uploading all three versions to redbubble because opinions are varying wildly XD

@WelshPixie Either white lines or none.

@WelshPixie the black one

@WelshPixie black lines or no lines. Lovely. Did you draw them yourself?

@WelshPixie Tbh, I feel like I'd pick different ones depending on the intended background. Contrasting lines with the background, or no lines with some lighter backgrounds.

@WelshPixie no lines

@WelshPixie No lines

@WelshPixie not the white lines. Black and none both look "right"

@WelshPixie I like the black lines

@WelshPixie Oooh, no lines

@WelshPixie White lines on a dark background.

@WelshPixie No lines, black lines, white lines, ordered from best to not-best (they're too good to say worst)

@WelshPixie for me, without the lines, my mind doesn't get it right away. Takes a moment to see through it.
The white lines stand out a little bit too much, a bit too harsh. The black lines are more subtle. Can appreciate all 3, in a different way, so difficult to describe. To pick one, I'll go for the black lines.

@WelshPixie no line (the most beautiful) or black line 😊

@WelshPixie Not white lines. But I CAN'T DECIDE between balck and no lines.

@WelshPixie no lines. #IMO

@WelshPixie I like them all, but I'm particularly taken by the middle one without hard lines

@WelshPixie I like the one with black lines the most!

@WelshPixie no lines!

@WelshPixie my pref is no lines

@WelshPixie - the black lines