Have a look on https://sketchmob.com/ , has many different artist with a variety of styles and price ranges. I use this site a lot. Source: over 1 year ago

If there's a particular artist whose style you like, see if they do commissions. Maybe try searching for the characters on DeviantArt to find an artist who already has a familiarity with the franchise. You can also get art done from sites like Sketchmob (though, you may need to find some reference photos to give the artist an idea of what you're thinking, I'm not entirely familiar with the procedure there). Source: over 2 years ago

What's more important is this beautiful work of art! We have an excellent piece by "mapo_tofus" on sketchmob.com of Lucina playing the clarinet. I essentially held an amino poll with 5 characters to potentially be drawn playing the instrument, and Lucina won, and I actually wanted Lucina to win anyway, although you might be disappointed when you find out who she won against. Source: almost 3 years ago

For the filtered images, https://duotone.shapefactory.co/ is another free tool that saves you time doing it yourself in Photoshop. Source: over 1 year ago

I think it is called duotone. You can find more examples here: https://duotone.shapefactory.co/. Source: over 2 years ago

You can use the website https://duotone.shapefactory.co/ for this. Upload a photo choose two colors of your choice. Source: over 2 years ago