Reference: https://drawbotanical.com/how-to-draw-a-rose/
My rough sketch has a different angle of view - where you can actually see the center more. In the non-sketch version, i tried to replicate the angle but largely failed. The center part looks detached to the rest.
But trying to predict where the shading would go without looking at the reference was fun! Seems intuitive once you fix a position of sun but still actually shading it is rough. 
Petals are still really hard lol. Practise + full: 