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Cassofish
Practice— but not just for the sake of practice like people might try to tell you. The best kind of practice is
effective practice (like "effective altruism" instead of just being altruistic for the sake of it), studying what you want to improve upon and honing your understanding of it, be it an anatomical weakness or a new subject like a different kind of animal. Even if you are already familiar with a subject, it's good to get some exercise in for your comprehension. Just make sure to give yourself some breaks too, and don't force yourself when you sometimes just need to sit back and let your mentality rest.
Instead of focusing on the anatomy and complex curves of the muscles themselves, try starting with basic shapes to help get proportions and stuff more to your liking— I start with circular shapes for the head, a box for the chest, circles for the shoulder and thorax, and so on. I recommend circles/ovals, squares/rectangles, and triangles until you get the hang of it, but if it doesn't click for you that's okay! It's just what's helped me a lot so you never know if it may help others.
Challenges are also a good way to experiment and improve yourself, like CoffeeCaat mentioned; drawing challenges, contests, and even fanart can really do wonders to the imagination, and it's a fun way to open your eyes to different perspectives. Just make sure you're in some way still interested in the drawing, otherwise it can be hard to keep learning if you don't have the inspiration to finish the piece.
Accept imperfectionism, but don't fail yourself by slacking off completely (otherwise how you gonna enjoy art?). Nobody is perfect... And that is
okay. While there are basic fundamentals in art to generally make works of the sort more appealing or successful, that doesn't mean you gotta go with the current— and most importantly, you do not have to hold yourself to ridiculous standards. Having goals and being critical of yourself is great, but it needs to be
constructive. If you don't like something, sit back, take a breath or even a little break, then ask yourself that "why?" "Why does the hand look broken to me?" "Why does the face not look quite right?" It is true that artists are their worst critics, and it's so much so that the art community overall undersells their own talent, which is heartbreaking to see. But also, while perfectionism and detail-fixating (whoops) can be a bit too extreme sometimes, there's nothing wrong with taking your time on a piece if you're really feeling the creative juices. But having sketches and stuff that are wonky is okay, great even! They exist to help teach you and figure out what does and doesn't work, so that you can do better on those quote on quote "masterpieces" when you really want to get the lineart or shape right.
I myself still struggle with colouring especially; my drawing originates from using only a mechanical pencil and paper, so I can certainly understand the struggles of learning digital art. There's always YouTube videos you can look up though! Just make sure to consider whether they're constructive tips or not, especially for you and your journey to learn. (Speedpaints and watching how other people started their drawings has been a huge help to me in the past, even if they're from 2014) But if someone has a similar style to you, then it's okay to use them as a reference (even tracing is a good way to learn— just
do not claim that work as your own, it's purely for self-teaching purposes and broadening fundamental comprehension (aka get an idea of the shapes used instead of focusing on the minutia). Use references for public/published works, it is
okay to use references!)
Speaking of which— never stop learning. You will always learn something new, and if someone is nice enough to offer feedback that is constructive but honest? That's gold right there (aka. make sure to understand the difference between constructive and toxic criticism— ignore trolls and don't let their spite get to you, but appreciate people who take the time to give honest feedback, even if it makes your poor little artist heart go doki-doki in the "omygoddidIscrewup???" way. The answer is no you didn't screw up— you are
learning and getting better just about every day, even if it doesn't seem or feel like it. And that's okay :) )
Also sharing your art and getting to interact with people is a great way to boost self-confidence— that's what I'm working on with my skin shop