Hey there! Have you tried a sharpie marker? Before I got into Copic markers, I used the BIC Sharpies. Now days they come in a large variety of colors. They are a lot more affordable but of course difficult to do the shading. But if you just wanna add some color to your images these are super.
I know it's no where near Girl's Day but this card was made using the sharpies. I hope you enjoy and Have a great day!