Dear god your Nakadas look amazing, I neeeedsssss LOL, and these aren't sketches?? They're doodles.... One might wonder what the difference is, and I can elaborate XD
A sketch is not very well done generally, unclean, and seemingly unfinished. A doodle is clean, can be extremely well done, and is finished. The difference between a drawing and a doodle is that a doodle is generally random...

_{I'm sorry for rambling, just thought you should know that your art is waaaay better than a sketch <3}