I tried to draw completely from imagination with no references. First drawing on my tablet

I've finally bought Clip Studio Paint for my tablet! I'm pretty much a complete beginner at drawing and digital art. I draw by reference and the pics are done with a mouse. It's appreciate if you could comment somewhere I can start with 0 experience to learn. Pics of art I've drawn from reference.

I got the sketch of Calli too. I think she looks even more adorable in the sketch. #Callillust

#Callillust V Calliope singing Helena from MCR

This is my cat. His name is Bilbo. He's just a little guy and wants your headpats. He's a bit eepy right now