I'm going to start having a go at adding more detail to my fantasy works such as extra body parts, extended Jaws, alternated tails, horns and much more

I'd appreciate if anyone could comment some tutorials or even some suggestions below :)

Still looking

Naia-Art and Vizseryn are amazing digital artists. They do paintings but you can get a better idea of placement and how things should look. You can find them on DA and youtube. Naia-Art does full time videos where as Viz does timelapse and some videos are tutorials