Mixing Substance

WALHT create a substance that is strong enough to make a structure. this could be to house an animal or group of people.Or even hold up a fence post. 
I am learning how to make concrete with cement stones,bark and potting mix.
I found it hard because I didn't know how much water to put in when it was dry.
Next time I would like to use black sand.

Modifying image

WALHT  modify an image for reuse. Using a poly line to change the color in shape,and add a call out.

We are learning how to use a call out and a poly line.
I found it hard to use the polyline and I found using the callout easyer.
Next time I would like to do more poly line.