Maybe you've just acquired burnout. I think you can take some time off from drawing if you're feeling no passion for it right now. It will come back after some time when you feel refreshed enough.

Oh, thanks for the comments.

I was feeling uncomfortable with the painting.
I agree.
When I feel calm, I draw a picture again.
It may be good to repeat it.

i agree with Trondir it sounds like burn out

Thanks for the comments.

Exactly that would be Burn out.
Take a break and switch your feelings.