let's draw a tree

a tree is not simply a drawing, it is a lifeform, i assume you wanted to draw a oak tree, aka the tree everybody draws
so, to draw an oak, you gotta know how an oak is, from the bottom up
first, the roots
from the images i've seen, the key word was "crossing", the roots crossed and fused with each other, without changing the direction of their growth

next, the trunk
the trunk seems to go up with no bends, with the branches splitting in pairs from the trunk

next, the fun part, leaves, the leaves come from the tips from the branches, and their distribution seem very uniform

you might have noticed i haven't changed your colors, so im gonna say how they are
seems the trunk are very very desaturated and dark browns, while the leaves have from dark green to a bright almost yellow color
so, here, have a sloppy coloring

hope you learn something fromt his, i know i did