-22-2-2005 award: Deviation feature, Deviant Art (USA): "An oil painting that is amazingly simple in composition and subject, but hauntingly riveting in execution: Chiaroscuro III by Valkenburg. The title, Chiaroscuro, refers to the strong lighting contrasts used in the painting. Caravaggio is well known for his genius with this painting technique." http://www.deviantart.com/deviation/15030991/
-Art contest, Art Wanted (USA), aug. 2005, 2e plaats (127 deelnemers) (schilderij Trifixion). http://www.artwanted.com/mb.cfm?Task=Topic&Topic=159356&Cat=6
-Mystics, Art van het jaar 2005, (2e plaats) (schilderij 'Nebula'). www.mystics.nl
-Art contest, Art Wanted (USA), juni, 2007, 2e plaats (174 deelnemers) (schilderij 'The Astral Sleep'). http://www.artwanted.com/mb/contest.cfm?Topic=398796
-Art contest, Art Wanted (USA), oktober, 2007, 1e plaats. (schilderij 'Lycanthrope'). http://www.artwanted.com/mb/contest.cfm?Topic=431059
-Art Wanted, featured image, 7 oktober 2008. (schilderij Mountain King). http://usera.imagecave.com/valkenburg/artwantedfeatured.JPG
-Artwanted, 'The color Orange contest', winnaar (107 deelnemers) (schilderij 'Brisingamen'). www.artwanted.com/mb/contest.cfm
-Mijn schilderij 'Lycanthrope' was de winnaar van een Italiaanse kunstwedstrijd, het thema was 'woede' (maart 2010).
