Apps used:
Picsart
Or
Adobe draw
(Mine isn't working rn but you can do it  just the same as picsart)

Picsart:
1.
Open your cover and go to draw. Use the color dropper and put it over the object your going to  draw on pick the main color of it. Color it in and then hide the layer.

2.
Open a new layer and use a darker shade of the color that is your main color. Trace any designs on the object this may take some time.  Now you can unhide your layer and clean up the edges and your finished.

Add your text and your finished!

Here's a gif of the process

FONT:
Adleit

So this is like making a vector but not doing all of the picture. I think it looks cartoon like when you do it, maybe I'm wrong? But I hope y'all like it! Happy editing lovelies!!