it's important to start out with realistic drawings anyways, since it can be applied to a more cartoony style later on. it doesnt work the other way around. also i think itd work better with your level right now. cartoony styles require more of a clean lineart than what you're doing now.

it's good to have a reference photo for drawings, however if you're copying the photo itself then theres not much of a learning curve. i dont mean tracing it, i mean drawing it exactly like the photo.

you should blend more. using your finger to do so is ok but you should really use a blending stump if youre not.

the top left corner of the iphone shows too much of its side, and makes the phone look bent. try putting stuff on the screen to practice perspective.

good start.