When you install Picture to Realistic Drawing Converter and open it, you will see the option of Add File. Use this to open the image you want to edit or drag and drop.

SoftOrbits tool gives you a toolbox on the right side. The first option you’ll see under it will be Style, from which you can select Realistic, Classic or Detailed.
Realistic: Realistic style will give you a good balance between subtle outlines and detailed shading. This style will also retain the lights and shadows so that the final image will look like a professional work of art.
Detailed: Like the name suggests, the detailed style will emphasize the details, especially the parts which require shading. You’ll get almost no white areas, as even the bright areas will have some light pencil shading. This style is great for landscape photos, although portraits require a bit more minimal look.
Classic: The classic style is the best for creating simple line drawings and subtle portraits. This style will give you very simple shading and bold outlines, which is great for creating a drawing with a soft look.

Unlike the sketch style, the preset affects the finer details of the sketch, like the colour effects, the thickness of pencil strokes, overall contrast etc.
It has a lot of different options, including felt tip pen, colour drawing, pop art, low contrast art, high contrast, soft black and white preset, simple paintbrush etc. A few of the most important presets are Simple, Light and Pen.
The Simple preset gives a paintbrush look, while the Pen preset is good for sharp, bold borders with a medium level of shading. The Light preset is great for creating line drawings and stencils because it results in less shading and more black-and-white areas!
A good tip is to watch the preview box over the original photo. That box will show you how the final sketch will look with different settings!

Apart from these options, it also gives you control over these settings – Contour, Hatching and Colourization . If you enable these options, you can change the edge strength, amount of shading, stroke thickness and intensity of each feature.
Contour refers to the outline of the converted photo, and increasing the edge strength or intensity here will give you bolder and more detailed borders.
Hatching settings affect the shading applied; darker areas will have more zigzag lines. Since excessive cross-hatching looks unnatural, keeping the stroke thickness and strength to a minimum will be better. This will help you create shadings without making it seem like a computer did all the work!
Colourization adds colour to the image, and you can change a black-and-white image into a colourful one. You can choose which colours are used and whether the image has a uniform pencil or a free-flowing paintbrush effect.

Once all your settings are applied, click on Run and see Sketch Drawer convert the photo into a sketch. Then you must click on Save!