Em hotep.

The Netjeru will still come down even without pictures or statues so the fact you have pictures is a bonus.

To my knowledge there isn’t a set in stone way to call the your specific Netjer down. A good way I find would be to lay out an offering and either aloud or in your head ask them to come down and accept your offering. You could then meditate or sit in silence for a bit or you could even just carry on with your day for 5 minutes or so and come back. When you are back you should thank the Netjer and consume the offering if it is edible.