8-Second Sketch That's A Sketch Not Final

Done as part of a practice session with poses of 8 seconds in length.

My current goal is: Develop my own signature drawing style (advanced)

This loose and light and lively sketch is supposed to be a rough sketch to be refined in the future, and it's not meant to be the final product. What do you think? What can I do to retain the guts of this sketch or am I all set? For more info, check out this link below. It can help you understand what I mean about maintaining the guts.