This illustration of a barn owl i find very interesting and colourful. The use of tone and darkness made with the detail of the figure and the features e.g beak eyes and feathers look very neat but the use of colour making it bleed out and splashed amongst the drawing makes it very interesting due to the fact the original colours of the bird are not present but a different colour pallete instead.
Madrid based illustrator Gabriel Moreno has a unique style that incorporates waves of hairlike tentacles which conveys a dynamic, flowing feel. Very cool stuff which I imagine is highly labor intensive but certainly worth it. Visit his portfolio here.