Add people shadow: Ctrl+J to duplicate layer & Ctrl+U to lower Illumination.Draw people with fine Brush, use Shift for straight lines and then paint inside with Bucket (New Layer).Add trees and plants with Brush (you can download them from a lot of pages including us) Remember to do this step in a New Layer.Draw Clouds in a New Layer with fine Brush.Outline edges with Brush at 0% hardness (black color and then lower Opacity).Lower Brightness in places with shadows.

Eliminate parts you do not need using Invert Selections and deleting from Layer.Add concrete texture and transform it pressing Ctrl to follow the perspective.If needed, use the wand or other Selection tools. Add sky and elements with the same color using Bucket and Brush with 100% hardness.Fill gaps with Clone Stamp and eliminate what you do not need with Eraser.Draw Concrete texture with fine Brush.Paint with Bucket faces differentiating light and shadow.Preferably, use the Hidden Line Style to get a clean image Export a PDF File from Sketchup (or any other 3D software).

Photoshop grass brush missing