Could i still get a good rounded look to my shoulders by just doing heavy presses and rear delt flyes?
That really depends upon your genetic potential. If you are asking the question, probably not without direct training of all sides of the delts. The exercises that you mentioned primarily work the rear and front portions. It helps to put in a side delt movement such as lateral raise or upright row to the lower chest.
I know that you did'nt ask but try this program for added delt size if you wish:
You will need access to the following:
Either a barbell or a smith machine
Dumbbells
Reverse pek dek (or you could perform rear delt raises)
first warm up the delts with a light and moderate set of 15 reps for the first one and 7 reps for the second one on overhead front shoulder press
Okay once you are warmed up do the following routine. Exercises that are followed by a -ss- are considered a superset and should be done with no rest from the exercise before it. Repetition speed on all exercises is 2 second raise, 2 second pause, and 4 second lowering.
Seated side dumbbell raise 5-6 reps to failure, reduce weight by aprox. 20% and go to failure again, once again reduce weight by 20% and go to failure again
-ss-
Upright barbell row with moderate grip (pull bar to lower chest line) 4-6 reps to failure, reduce weight by aprox 20% and go to failure again, reduce weight once again by 20% and go to failure
-ss-
Seated front presses 6-8 reps to failure, drop weight by aprox 20% and go to failure, reduce weight by aprox 20% and go to failure again
okay rest about 60-90 seconds and do the rear delts
reverse pek dek flyes or bent dumbbell rear raise 6-8 reps to failure, drop weight aprox 20% and go to failure
-ss-
shoulder width bent over row (important: pull bar to lower chest line) 8-10 reps to failure
rest 60-90 seconds
Shoulder shrug with barbell 10-15 reps
One cycle through this will torch your delts if you do it exactly, and will be enough to make them grow round and full, providing of course you have the rest of your stuff in order. Do this once a week only.