A source of frustration I have is that I sometimes wonder if I've improved artistically, something which I sometimes wonder when comparing my newer artwork to my older artwork. Another is the lack of attention I receive, something which is very silly, especially since I am a hobbyist, but it is always a bit frustrating to see your art get ignored, especially if you worked hard on it or did something you are proud of with it.

As a writer, I often do so much dialog I forget everything else.

Whether or not my skill is improving or declining.

Honestly, it's hubris. I'll look at something and go "Oh, that looks really easy! I bet I could do that!" then fast foreard three hours, I'm still trying to kep it right. 

Impatience. I have a lot of ideas and a decent amount of skill to pull them off- but I get frustrated excessively easily when the picture in my head isn't appearing on the canvas as quickly as I want it to. A lot of this impatience comes from not having the sheer technical practice to just poof my ideas out without satisfactory planning first. Part of working through this has been to just- accept that art takes time and I dont have to finish something the same day I start it. Its a struggle, but I'm starting to get the hang of it.

The conversion of time to money and the needing of money to stay alive. 

If I'm in another job, I don't have hours left in the day to practice art.
If I'm doing art for a living, there is only so much time I can dedicate to each commission based on the budget, so it becomes more important to be efficient than to experiment with a new technique or try something more difficult that could lead to improvement. 

Being an adult is a real downer.

my art life sometimes it just when i look at my old art on this site (i improve rather rapidly) and all i can think is (i don't like this) how can i fix it what can i do and its so weird i juat want to keep redoing all my art work witch is a proboblm since i keep rapidly improving but then i feel the need to redo old stuff a example is my character Max its super old art when i was really new and just found the site and then i made nameless and im getting ready to make 2 or 1 more character or revamp them both

I get frustrated with perspective. There's so many times I wanted to draw objects in perspective and I end up just copying a reference or doing it front facing to make it easier. Or I attempt the perspective and it turns out kind of wonky. I did get a new tool recently lazy nezumi which helps

applying knowledge to my art
I would find a neat tutorial and then my mind blanks out, it's often frustrating

I got several issues as an artist such as Artist blindness, which is when other admire your artwork but I'm not satisfied with it and try to fix everything cuz it looks ugly and get me stressed so much. The other is my long art blocks I get, usually about 5 months to 1 year and 2 months all caused by a large amount of ideas of motivation that overwhelms me. I get very stressed as an artist.