I must say that minimalist signatures are quite easy. Just get the color combination right and you're an instant professional designer in just 1 night Now i'm rather curious about your font selections. Can you recommend some of your fonts that you use for those arts?
I'm already a professional I literally just spam choose a font on the list and see if it styles well. I'm mostly drawn to Sacramento tho
Try using Beyno font for futuristic-minimalist looking font, they used it for the Black Panther movie UPDATE: I tested it on a retro-background, mixed with a Visitor font. Lookin great so far.