The easiest way to simplify is with shapes. Break everything down into a shape, [roughly] measure the proportions (everything lines up with something!), then add the details after.
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I recommend practicing this lesson and the others on the site, because the lessons can be applied to anything you want to draw:
https://drawabox.com/lesson/5
[This is the 5th lesson; I recommend starting from the first.]
And test everything out on Procreate! Look up some tutorials for it!
It's good to get comfortable with the tools, clipping, layer modes, etc.
It makes things a little quicker and
lot easier.
Other tutorials by artists on YouTube, for colour, style, and anything like that are also really good for helping breakdown the process, practice good habits, and show you how to "fix" bits you might struggle with.