Environment Thumbnails

Step 1:

Make 9 thumbnails of environments
in iPad ratio
Use Susan Bonner's iPad with bonus HD Format thumbnail template (use the ipad one with white or black iPads.)
Get the iPad Game Size and HD Film template.
Game Design iPad and HD Template: concept and production art
See how to work with the layers.
The template has white iPads, black iPads and HD for film.

The dimensions for this project will be determined by what you intend it to be primarily used on when complete; a tablet (iPad) or phone (iPhone).

For iPad dimensions, it should be 2732 x 2048 pixels (12.9 ipad pro): 1536 x 2048: iPad Pro 9.7 etc most iPads on market.
For iPhone dimensions, it should be 2436 x 1125 pixels
Moving Target (These sizes are all over the board, basically, pick a size and start your concept, leaving lots of bleed on the edges to be able to move into another format.) See the apple developer display sizes.
You may need to work at the file at a larger size:
Double the size- This helps you to zoom in as you work.

See how to work with the layers.

The template has white iPads, black iPads and HD for film.

Here is your moving target for Apple iOs.

Show gameplay
Have room for the character to play (you can sillhoette your character in for scale)
decide on camera angle
Consider showing obstacles, goals, and rewards
Show variations of some environments for choices and/ or level designs
You will be choosing one of these environments to fully render and that should be an environment that can have the character, GUI, some obstacle, goal or reward
The environment should tell the story.