Cop outs! Every artist is guilty of them in some form or another. Personally, when I see other artists' work and I notice that the hands are hidden behind the clothes or conveniently out of frame, I can't help but laugh. It's an obvious cop out, and one that I myself have been guilty of exploiting from time to time. Less now than I used to, though.
So let's lay it all out on the table, just this once - what sort of cop outs have you taken before in your art?

lol I'm SO guilty on hiding hands and feet haha. Well, not anymore, but I used to do it A LOT. I still have a really hard time with hands and feet, but if I always take the easy way of hiding them, I'll never learn how to draw them. Maybe my drawings take more time now but at least I learn something and they don't look so lazy haha
I try to push myself but one of my biggest copouts has been using textures/gradients instead of shading in digital art. :x Lately I've been pushing myself past it though because I know if I never tackle shading I'll never grow. I've been getting a lot better though!
Let's see.... cop outs.... just loosely indicating materials with lazy textured brushstrokes instead of doing them thoughtfully. :o Not drawing environments, ever. Trying to draw an environment and just drawing a building instead, giving up and calling it good. Not practicing proper perspective and trying to absorb it through repetition instead. Relying on repetition to strengthen drawing skill without much care for the final product. Yup.
I pretty much have copped out on drawing the male human body by telling myself that all I need is just the bust of my characters. I mean, I've been trying to figure it out but it's taken me two years just to figure out how I want draw the busts.
Sad part is I can draw a pretty fair representation of a woman from the waist up (including the hands). It just doesn't do me much good when almost all my main characters are male... and muscular. -sighs-
If it's just one part of the body, I'm usually up for studying the anatomy of the thing that I'm struggling with it buuut:
-I draw mostly men all the time because I find them much easier and generally more enjoyable than drawing women.
-I like detailed clothes, but find simple t-shirts and such very boring to work on, so I draw a lot of shirtless guys too if their clothes aren't interesting to me.
-and holy shit expressions. I really, really need to practice these so bad. Most everyone I draw has one of the same four expressions and it never involves an open mouth because I think I make them look funny.
-Also animals. I need to draw more animals.
Basically I was never big on hiding hands and eyes but I've forced myself into a niche of shirtless, somber men by avoiding most other subjects, haha. u___u
Perspective. Unless I can copy directly from a photograph, I avoid almost anything that requires perspective drawing.
i'm guilty of occasionally hiding hands as well, but often i'll just trace them from a photograph ;-;
i also can't shade for shit so to give my art some visual interest i sometimes add a simple texture :/
oh, and don't forget hiding the ears with lots of hair!
EYES. Ugh getting eyes to look even is the bane of my art existence. I hate it so muchhhh. I always draw an eyepatch or cover an eye with hair. I even have a character that wears a ribbon over her eye for no reason other than aesthetics.
Sometimes when I draw I'm really happy with the pose and rest of the body but have no idea what I was trying to do with the arms so I just hide them behind the character's back so from the shoulders to elbow are the only things that are seen.
Also I dislike drawing legs and feet so most of the pictures I do are from the knee up.
I rarely do backgrounds, when I do it's either just a solid color, using the gradient tool, or a big floating orb of color behind the character.
I'd love to do more dynamic poses but unfortunately it just turns out that all my characters constantly stand around with their hands on their hips.
All my characters face left. They're all looking < that way. Ugh.
Fellow hand/feet hider here. lmao I tend to always draw faces at 3/4 view. usually never head on or profile. the hardest ones for me are when a character is looking up or down. I want to keep them at the 3/4 view and just make their eyes look down. LOL ugh u__u