Water color pencils - Apple mango

Pencils are very difficult to use as painting tool for me.  It takes time and difficult to show the depth... I don't know the right way to use this...

「水性色鉛筆・アップルマンゴー」色鉛筆画の描き方をよく知らないので、とても難しい。絵の具と違い、あまり上塗りできないので、立体感が出せない。