I find difficulty in getting started. I could not make up my mind what to draw. I found it hard to choose my subject. I was oscillated between the shells and the chrysanthemum. I started with pencil studies because I found that helps me see things more clearly. I did some thumbnail compositions for the chrysanthemum and tested out the marker pen. I found marker pen is OK for a close-up drawing like the one below but not for the whole arrangement with the flowers and the vase altogether. I found it too difficult to depict multi-layers of the petals and foliage with a very limited range of hues. I may tackle it again in a later day but for now I decided to go back to my shells.
The following is my final drawing with marker pen in my A4 sketchbook. I only use yellow, brown, black (outlining the shells) and purple (shadows).
I chose the shells because they were the poor creatures I ate in my summer holiday in France this year. They reminded me the good time. Of course I love their shapes too, particular the spiky one. Initially, I put two spiky shells on the left and three others on the right. I found that was too crowded so I took away one spiky one. It gave the remaining one space to show off it distinct feature. Also I used dots instead of lines for shadows. Lines suggest movement but dots unify the objects better.