@Lunna prospective is the way you see the shape. Like if you rotate the cube, your chaging which angle you see it. And YES it’s hard. But watching some tutorials should help. And my basic tips is to use ips paintX and defo learn how to sketch before drawing full stuff 
ᴵᵍ/ᵈⁱˢᶜ:ᵏ.ᵗᵗᵗᵗʸʸʸʸ⋆✴︎˚🇸🇴•¹⁴•ˢʰᵉ/ᵗʰᵉʸ
ᴾᵃᵖᵃʸᵃ ʳᵘˡᵉˢ •^•[#⁸¹ ᴼᴾ]ˡ</
