I've done recently some tutorials by Feng Zhu (LINK), after my last try with envi and "speedpaints" ;)

and study of llama for anatomicae theme (12.09.2012) LINK
ref photo:LINK

Baltic Sea

Sean Bean as Eddard Stark character © George R. R. Martin and HBO
used the screencap references

human skull study

ref from LINK

used photo reference:
[LINK] by Cathleen Tarawhiti

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

just a speed"paint" that I've done yesterday ;)