In this tutorial I’ll be using THIS picture.
Open up your picture in photoshop, color it, resize it and do all the things you want, then go to Layer > Flatten Image.
Once you’ve done draw a line like this:
Select a color that you like (I chose b91634). Then hit the Text Tool (T) and move it over the line.
When it looks like this and NOT like this
click on the line and start typing - followed by a space until the line ends, the text will follow the line you drew. I suggest to use Arial, the font size depends on how big is the image.
You should have something like this:
You can move the line using the Move Tool. If you want to change the inclination press CTRL + T and rotate the line, then hit ENTER.
Now draw another line and do the same things that you did for the previous line until you’re satisfied.
Once you’ve finished go to Layer > Flatten Image