For drawing people: After you've studied the basic anatomy (muscle system, skeletal, maybe even digestive), WATCH them in public. I avidly studied people when I was in high school and college to learn how they move, walk, lounge, talk, gesticulate, eat, etc. Many drawings I see lack the natural feel of the movement the artist is trying to illustrate because the artist doesn't actually understand the movement fully.
Same goes for animals; study their anatomy, and THEN you'll understand their bodies and how they move better. Nothing beats watching, though.
Go to life drawing classes or use a tool such as this one: [link]
I used to be skeptical about this, and I was wrong. It's an excellent practice and 100% worth your time, no matter what style you prefer to draw in
And use references if you're drawing something that you have never done before (or even if you have drawn it before). You might think you know exactly how something looks, but very often you don't. Using refs will help avoid that feeling when you sense something is off about your drawing and you have no clue what it might be
practice from real life. using models for poses or even getting proportions right. even working with still life's help. seeing whats in front of you while doing so. this can help with many things other then drawing characters but also backgrounds, which is what i've been trying to work on my self. even these things can help with coloring to figure out where your light source is coming from and what colors bounce off the items or model. try drawing the skeletal structure as well and figure out what the human or even animal body can do.
well... i think practice makes perfect so most important thing is to do practice and and try to copy don`t trace it`ll ruin your natural drawing talent, use a light pencil to start the rough sketch,tools don`t matter the thing matter is you drawing if your drawing is good you can even draw better than photoshop and other digital softwares,try not to hate your drawing because it`ll lead to to the path of being a great artist and.... i think its all i have in my mind hope this helps to improve your drawing
I could give quite abit of advice, but I think one that is really important to me is making sure what ever I am working on or doodling is interesting. I know that sometimes it can be hard to get into what your working on, but if it is something that you are interested in then you will always want to work on it. I also know there are times when you must work on a piece that you wouldn't normally do or want to do, but if you are able to somehow find a way to make working on the piece interesting to you then you will enjoy working on it more. I know for me I usually do more research on what I am about to do which really helps get me into wanting to work on the piece of art even more. I'll even look up professionals work to get inspired.
This has been an issue with me and I know quite a few other people struggle with finding interest in what they are working on as well. By doing what I just said above has really helped me out a lot. I hope this can help someone else out too.