i don't think my art is invaluable necessarily, because i agree that my effort and time makes it inherently valuable to me. but my art has no value to others, which is why i see no reason to post it at this current point.

practice in general is essential but personally i would recommend drawing from real life references to improve the fastest

its helps to strengthen all the fundamentals at once like perspective and shading and gradually you can begin making decisions that determine your art style