Very neat stuff there. This is just my opinion, but I feel like your work could benefit from some more dynamic lines. Your figure could be accented by lines that vary in thickness, but still have some edge to them. One artist I can think of off bat would be Juan Doe (Legion of Monsters) and Nick Roche (his work for Transformers). Something you could try for kicks is doing just the line work with no shading, making a copy of it, and try using some sharp/bold shading to really make your subject pop out and the background complement it. You already have the right idea with what you have here with the lighter shading in the bamboo and the heavier pen lines on the foreground. Invest some money in some gray scale markers and practice making your work really POP on the page. Good job!