/ic/ - Artwork/Critique

>>6216016
hello this is my very first image i drew since elementary school
a tree
my idea was to not use ereaser/undone and make it in as few strokes as possible
then i had idea to add ground, stones on ground, some grass and a river in background
grass sucks balls btw
ref images
https://www.happyfamilyart.com/wp-content/uploads/2015/03/LittleTree2v2.jpg
https://c8.alamy.com/comp/W4R8FC/contour-drawing-stone-set-vector-illustration-different-rock-blocks-W4R8FC.jpg
now how do i color it and shade it ? using krita
also what should i draw next for training?