Thank you all for your kind words.
Asnee, long time no see but I am not sexy like my lineworks lah. hehe.
Enrico, yes, that are coffee stains and I love them, it is therapeutic pouring anything on the paper.
Singapore sketchers are too busy with worklife so they may not upload their work here but you can see really stunning work at http://www.urbansketchers-singapore.blogspot.com