What software did you use to make these? What brushes and tools did you use for sketching, inking, coloring, shading, and special effects? Also, how long did it usually take you to make each of these?

I used ibisPaint X, basically I used Dip Pen (Hard) for the sketching, used either Airbrush or Watercolor (Real) for the background and shadows, and as for the retro effects after you finish your art, you can use special effects, here’s a video about it to help you out. :)

(Usually it takes hours or a day to finish up)

https://youtu.be/E9f_CA-4Qik