Singing birds - sketch

A sketch for the infographic/colouring page for my editorial client. It shows birds as they start singing in the morning. Birds are located based on what time they start to sing - on the bottom branch there are ones that start the earliest on the top branch the one that starts the latest. Birds sharing the branch start at the same time - clocks show which time they start. Gradient in the background also suggests that when the first bird starts singing it's still dark, and for the last - there's morning light already.
Let's see how the final will turn out :)