4 way tile ground texture demo explaining key to hand painted texture style is all on the subtle brush marks. Basically flatter the colors and bolder the brush marks out come will be more "cartoony" and more variations and subtle the marks more mature the style will be. All depends on what your end goal is but knowing how far you want to push is the key to the style. Theoretically more render you do to your texture more "realistic" it becomes.
512X512 hand painted ground texture
Gif animation step by step
Any question feel free to leave comments below and please follow for more. Thank you for viewing.