Artist here! Raised by an artist and surrounded by a bunch of artists trained in tradtional realism. I’ll just tell you what my dad always tells me over and over.
Use a larger brush at first, hold it at the middle/end of the brush, not too close to the bristles. Work loosely, relax.
Figures and still life:
Start off with very basic lines and shapes, even a stick figure with some circles to represent the shoulders, head, torso, etc, you will need to study a bit of anatomy and look at figures to get more experience in this. Drawing nude models is the quickest way to learn and it can be awkward at first but you’ll quickly get used to it because the result is so rewarding.
Still life is simpler because there’s no complicated anatony, but it’s a similar idea, draw the general shape, angles, just to get the dimensions correct. Then for both start to smooth out the shapes and get more detailed, add some features but don’t get too detailed if you’re painting.
When thinking about colors there are four things to remember: Is it warm/cool? Is it light/dark? This will help you narrow down which color to use when painting from real life.
White objects are never really white, it reflects the colors surrounding it, which makes it some of the most interesting and colorful things to paint. Cool objects in shadow, warm in sunlight. In a landscape the further away, the more light and blurred, the closer the more dark and sharp.
With the shapes you drew, start off by separating extreme dark and light, it may look weird, a face may have dark brown on the shadow areas and bright orange on the light. Continue to develop the colors as to what you see in real life, don’t be afraid to add colors you wouldn’t expect, skin ofsten has tones of blue or green. Same with still life. Basic dark and light colors first, then develop.
Hope this helped! Don’t stop drawing what you see and painting as much as you can. A portable watercolor kit (Windsor and newton) is great to practice wherever you get inspired. I love oil paint, but it takes dedication, and it can get expensive. Ink wash is a form of painting/drawing, and it’s pretty simple to learn. Acrylic is something most beginners use, I don’t like it myself though. Let me know if I need to clarify anything.