Black and gray nail design tutorial

Hello everyone :)
so... this design I would have considered it as one for Halloween...
because it is made ​​with only dark colors
may seem stupid ...bu in my view looks like a spider web...lol
However I am not quite good to do such designs
perhaps because in my country I have not grown with this Halloween event
Yeah...:(
I would have liked
anyway I hope you like it :)
kisses