as a reference used photo by Julia Starr: [LINK]

another try with landscape ;)
here is a photo reference [LINK]

done with tutorial by Xia Taptara :)  here is link http://idrawgirls.com

bird skull study

..

Study which I've done for CG HUB anatomicae theme "Back Anatomy"
reference [LINK] by Marcus Ranum or website www.ranum.com