Here's a dragon eye I drew, the scales took FOREVER. I don't use references a lot (I didn't use one for this), just letting you guys know. Now, the reason that the picture is colored and shaded weird is because my scanner app that I use for my art saw some shadows and such on the setting it was on. So I will post the version I took with different settings next. The reason I posted this one along with the other is because I thought it looked kinda cool.
I used a 0.5 mechanical pencil