At last! It is finished! Well, I'm stopping myself from fiddling with it any further anyway!
I chose to make the background a dappled yellow to hopefully make it a little brighter and sunny. I've also added whiskers in black pencil and white acrylic paint (much much harder than you would imagine!) to finish it off.
Do you like the yellow? In real life it's not as dark as it is here and is less overpowering. Is it too much? See, now I'm doubting myself...
Overall I'm extremely pleased with it. It's been such a learning curve and an experience for me. I've never drawn an animal this large and in this much detail and in this medium before.
I really hope that his mummy in Australia likes it as much as I do!
p.s. please forgive the awful scan quality. I'm going to scan it again and post that. It will be much better quality.