[ Various ] Warm-up sketches #1 (Patreon)

I've learned the good habit of sketching something before starting a big piece. Each of these sketches took me around 1 hour, but I hope I can become faster with practice!

I've put them in order so you can see the actual progress happened!

Consider that the Zhongzhu one is older, while the last sketch (Adam x Langa) has been done on my best friend's iPad and I'm not used to it - IT REALLYSHOWS DFGHJKL

What's your favorite and why is it the ZhongChizhu one?