There are times when I don’t feel like working, and times when I don’t feel like what I make is working. It’s important to remember that you aren’t necessarily the best judge of what’s “good” in your work while you’re making it. Often it takes time to be objective. We can’t often see clearly right away. We can be too attached or too dismissive.
Your scintillating prose, deft brushwork, catchy melody can look amazing or awful in the moment, and the opposite later. Or vice versa: things you thought were coming out so-so can be brilliant on re-examination.
What matters is doing things, creating art, on a regular, or better yet, daily basis. Once you have a pile of things is when you can be judgy. Don’t bother as you make it up.