I guess you just get used to it
I hate when that happens Bro, i've had this problem before too when I draw. Its like you draw something really good but then you notice its slanted or something. Its so annoying.
Ugh, ikr? Most of my traditional sketches tilt because I'm not always drawing on a great angle and I can't really tell...
Same! Another problem I have is sometimes my placement of a drawn character is too close to one of the edges of the paper.
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I hate when that happens, I have to alter the scale of an arm or leg when I do that. That or whenever I draw a tall character to far down on the paper and have to alter something to make them fit. (Nice Bro XD.)