Time!, when we spend money and it get finished we can always work and earn some more, while we spend money, we can monitor how we spend it and also know how much we have left but time, Time is the most expensive luxury. We spend time not knowing how much we have left and not knowing when it will finish, we can buy more time or work to earn more so use the time you have wisely and productively.
For the drawing the old man is practically living on time like an oxygen any moment it is taken your gone, I made use of 2b and 8b digital graphite pencils. Below are the stages of the drawing
