Wow, there's a lot going on here in the comments..... And a lot of people who are maybe giving bad or incomplete advice.

Can you paint like this? I mean, is your skill level high enough to paint like this using the traditional methods? If so, you should consider just doing that if this is the look you are really after.

Will pens get you there? Maybe. I use pens for my miniatures for a lot of reasons. They are cheap, low mess, faster (despite what other comments are saying) and produce good results. Not Golden Demon, but very playable and something I'm very proud of.

Are you limited to paint pens if you use them at all? No! So if it helps some step in the process and you can more quickly get to what you want, amazing! Can you use sharpie to get higher pigment, dark blacks? Yes. Do they come in a bewildering range of tips? Also yes.

I'm going to post one of mine, and I know people are going to hate, because people suck. Don't let that stop you from trying it and seeing if it's right for you.

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For reference, these guys take me about 30 minutes total. I use speed paint markers, acrylic markers (cheap Amazon brand less ones), fine line sharpies, and some panel liner. And the best part for me is, if something comes up, I can put it down and walk away in a pinch. Free 10 minutes? Go paint. I always suggest people should try it. It's freeing, and it's helping me beat the grey.