I have an iphone so can’t help other phone uses except to say –
Go to your App Store
Type in – Grid Drawing
If you find done great apps you like share them in comments for others .
This one is my favourite on iPhone
Use a black colour pen and outline the image, Great pens for outlines are Posca 1m, !mr or the 0.7m size in Tooli-Art or Artistro.
And if you want to add a touch of highlight – pop on a few dots and dashes of white paint .
You can find awesome fine Pens to help you with this here
This is my image saved for use in the grid app .
In the app you can upload your photo you need to put the grid on .
• Save my drawn image below to your phone
• upload it to your grid app
See where my red arrow points too
When you click there you can change settings
Decide how many lines you want in the grid you can put mire it less .
Some grid apps make you pay to download the grid on image – I just screenshoot it 
I don’t have photos as I work on the rock as I did not set out for this tutorial to be about grid drawing. But here to the left it is on paper – you do this in pencil on your rock
Using a regular lead pencil –
My grid above has 4 rows across and 4 rows down
•They are square each small grid
•Ignore that the image looks rectangle
• see that this rock is smaller in the horizontal line – left to right, the width . Divide this by 4 the rows I have in the grid. If your rock us a different size your measurements will be different to mine.
My rock is 6cm from left to right so
6cm divide 4rows = 1.5cm
Every 1.5cm I draw a down line on the rock .
Now do the same the other way find the centre point a draw a line across then draw all 4 lines – 1.5cm apart. You know have a 4x 4 grid on your rock .
Now you have a grid on your rock
Look at the image above with a grid on it
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Draw what is in each square on that image in the same squares on the rock
– you are drawing square by square it will become the bigger picture.Once you have your image in pencil go over the image with your black acrylic paint pen Fineliner . Let that dry and erase all your pencil lines . You now have your image on the rock . If you are not sure click below to learn how to draw on rocks.
Colour on your rock – I have just painted a nice even layer. You do not want to paint it to thick. The more layers on the rock the more chance it has of peeling off later as the water in the base evaporates. Click on the image below to find out how best to paint on rocks!
Shading makes all the difference to the end result. Adds depth to the Image.
I use clean water and a size 2 or 4 filbert taklon paintbrush click on the below image to learn the technique – or head to YouTube to watch how I do the shading.
Click on our “Let’s Learn Links” below to learn some great techniques.
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