Developing ideas mixing artists and theme

I started a development sheet focusing on mixing ANATOMY and My icons.. Anatomy and art is the mix of diego Max's work. ( one of my chosen artists ) 

So I researched human anatomy and looked into things like skulls, brains and hearts and how they are drawn in anatomy and then looked at how diego adds this element into his work, he also uses nature such as  birds and butterflies so it got me thinking how I could re create his ideas to make it my own. 

I had the idea of using 4 skulls each symbolising my icons, then I decided to think of what reminds me of the icons so I could add this so you could identify which skull was who! 

Freddie mercury the crown and moustache because of the famous crown he wears in his wembley stadium performance in 86 

Madonna a big bow because she wears them a lot in her iconic looks from the 80s 

David bowie the zig zag on his face because of alladin sane album cover ( also one of his most memorable personas ) 

And prince with the famous purple coat and white bold collar. ( I was going to add circle sunglasses like he wears but after attempting it didn't look right as the skulls are already round where the eye is )

And the DOVES because diego max uses birds but I chose doves because they remind me of prince because of the famous song ''when doves cry''.

I used shading pencils, acrylic paint and fine liners to create the main part of the board.. The background is washed out brown and yellow using watercolour to give it the retro look diego max uses..

Happy with this board although I think it would look better drawn over newspaper or ripped out pages from books, to give it a similar look to how vinatge anatomy is usually drawn.