The way they look is based off what I would expect them to look like thanks to my interpretation of genetics. Anyway:

Tony:

You are working on your dad's broken down limo

Steve:

Taking Toby on a walk before your Netball match

Natasha:

It is the 100th art Sunday

Bruce:

Working in the lab with your dad on a newly founded insect DNA. D

Clint:

You and your dad went hunting and you went hunting with your new bow.

Your first day training for SHEILD to be the next Hawkeye.

Pietro:

Getting ready for your race coming up, and you decide to train with your dad.

Wanda:

You are reading in the garden for a break from school.

Loki:

You are going to Asgard to celebrate Thor's Birthday

Thor:

13 years difference from photo one and photo two, both you skating. (8 to 15)

Bucky:

On your way back to school, your not exactly excited.