Dude, I've been feeling exactly the same way these days. Specifically, like I'm doing everything too slowly and how none seems to matter and how I'm never going to be recognized or be as good as other's amazing works.
Let me tell you, that's all bull. You know it, I know it, everybody knows it.
There are low days, there are high days, and all kinds of grays in between. Definetly might need a break, exercice a bit, go for some drinks or food you enjoy, have some fun, and your persepctive suddenly seems different.
You art is amazing. It has great technique, and it's clearly getting better.
Enjoy it, treasure it, work towards your personal goals in a measurable way and admire how you are now better than you were yesterday, and how tomorrow you will be even better than today.
We all fall in there, and we will get past it, just as long as you keep walking. No matter how fast. Just keep walking.
More to the point on this drawing, your stylzed faces look great man. Well proportioned, I can clearly identify the main pieces with such elegan lineart. It's good. The screentone doesn't seem to render properly digitally, becuase of the damn moire effect. But othewise it's really well done.
And the dinner is pretty cool xD nuclear boom trees, ha. Good one. They do look like nucelar blasts. That's a fun theme.