Let's start!
File - New Image - 600x600 White.
Layers - New Raster Layer.
Flood Fill this layer with Dark
Green (#385836) or use a dark color from
your tube.
Layers - Load/Save Mask - Load Mask from
Disk - dmsk0015
Source Luminance
Fit to Canvas
Invert Transparency - Not ticked
Hide all mask

Layers - Merge - Merge Group.
Copy (Me~AugustFencesm_KK.psp) and paste
as New Layer.
Effects - 3D Effects - Drop Shadow:
2-2-75-12 Black.
Copy (Sheila-sbp-floral5.pspimage) and
paste as a New Layer.
Move down to the right (see example).

Effects - 3D Effects -
Drop Shadow: 2-2-65-10 Black.
Copy (qtf_anime-6-21-11-2004.psp) and
paste as a New Layer.
Move down a little to the bottom.
Apply the same Drop Shadow.
(Effects - 3D Effects - Drop Shadow:
2-2-65-10 Black)
Copy the Text (tekstsummertime.pspimage)
and paste as a New Layer.
Move to the tops - near the clouds.
Copy (Barney_Sun_KJC_9.0.psp) and paste
as a New Layer.
Move up to the right.
Apply the same Drop Shadow.
(Effects - 3D Effects - Drop Shadow:
2-2-65-10 Black)
Add your name or watermark.
I used the font CrossStitchSSi, size 36.
Layers - Merge - Merge All (Flatten).