Some young artists have the tendency to be perfectionists and maybe a bit too analytical. Thus, they become so trenchant in their own work, creativity becomes professedly limited and one can find himself in unsettling unfulfillment. As someone aspiring to become an anime artist, you should realize that there is no better time to make mistakes, develop your technique and learn. Experience and practice expand in accordance with each other. Habitually, your hand begins to impose a natural feel and with practice, it will be eventually custom for you to draw that one daunting line that you could never get right.
Sometimes, your setting can also influence how you tackle an assignment. Do you keep track of where you draw and the time frame in which you do it in? Try not be so "fixed" that you end up being so suffocated and you restrain yourself from trying anything new and innovative. This could contribute to the frustration.
It's also a possibility that you are so troubled by one minor detail that you only provoke more stress. Don't be so fixated in one general location and remember to always look from a distance to check on your overall statement. It's okay to encounter some bumps on the road. Try not to think of these errors as mistakes, but as a constant reminder that artists are humans. If they were always perfect, one would be reluctant to still consider calling it art.
Lauren Nwachukwu- There are no mistakes in art, just opportunities to embellish.