hello itīs nice to see a good pacing on your studies keep like that and you will improve greatly the only tips that i can give you itīs only from my personal experience and since iīm no pro take it with the grain of salt.
- focus on the form, when drawing/painting think in 3d
- perspective, itīs a very boring subject but itīs a important one, with perspective you can scale and pose any object/person accurately any way you want it
- when painting keep it simple avoid massive blending and focus on the color try to decode them if you have trouble to decode any color use the color picker, although donīt rely on it
- pure black and pure white dull the colors so use it wisely
thatīs it for now, keep it up