Yo.
I tried realism! [I tilted my reference]
I got terribly lazy at the end, and the iris was the hardest. (So was the light beam) I had a difficulty with getting the textures and highlights right....
Oh, and I've changed to ibis paint. It MUCH more efficient, but it takes time to get used to it. It also is a bit difficult with all the additional features, but they are all worth it!
Hope you like!