First the type of outlining starts with just a straight running from start to and then holding the line to make the line thicker depending on the size you have chosen. this is mostly the choice for making sharp corners.
The second type is for making small corners, just make a curve and hold then when the top part of the page say arc, you press it adjust it and you have just made a small curve for round and for inside lines you should pick the lines to be thinner.
First just choose the real marker pen choose your color and then start with coloring the sides with your
Next start adding more line from top to bottom until past the halfway line by a little bit. Make the right left corners of your page adding darker and darker layers there and asks you come from the side just add less layers on and on.
last part for the rendering you should use a darker colour around the objects with a little darker color
For extra just find a picture of a sea of water and add it to places that has clear areas for water to flow that is transparent. put it on the areas that need water flowing and resize it as to youself and renember so cover all the areas.
Crop it to the areas by using the selection tool tapping the areas that need to have water flowing and invert so the picture is able to be cut or can be using the mouse button and taking out.
last use the airbrush, use a black color and crop the area that you need to be darker, for example for mine on the bottom right of my kettle needs to get darker as it doesn't get enough light unlike the top left part of the kettle
Same goes to the areas on the top left of the page. just crop, instead now change to the color white and start slowly shade the top white areas of the kettle