Colybrix, thank you very much for your permission that I may translate your tutorials

 Tutorial here

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Plugins

Graphic Plus

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Colors

Color 1 – foreground : #a2bcc8

Color 2 – background : #1c4051

Color 3 : #1686c3

Color 4 : #ffffff

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1 - Open Alpha Sous la mer – Window / duplicate  (Ctrl D)

We work on the copy

(it contains selections)

The white layer will be removed at the end of the tutorial

2 - Layers – New Raster layer

Fill with background color - dark color

Layers – New mask layer from image – select Mask0176

Layers - Merge - Merge group

Image – Resize 95% - all layers not checked

 3 -  Effects 3D - Effects 3D - Drop shadow  - check shadow on a new layer

Move to the top layer

Adjust - Blur - Gaussian blur 10

 4 - Layers – New Raster layer

Selections – Load / Save selection - Load Selection 1 from Alpha Channel

Fill with the light color

 5 - Layers – New Raster layer

Put in the foreground the pattern provided with these settings

Fill the selection with this pattern

Blend mode Overlay -  opacity 85%

Layers - Merge - Merge down

Effects 3D - Drop shadow  14, 10, 35, 35, black color - uncheck the bottom box

 6 - Effects Graphic Plus - Cross Shadow

*on my version 2 I lowered "intensity" to 15 my light color being lighter than the original

 7 - Layers – New Raster layer

Selections – Modify - select - selection borders

Fill with the pattern, same settings in memory

Layers - Merge - Merge down

 Selections – Select none

 8 - Layers – New Raster layer

Selections – Load / Save selection - Load Selection 2 from Alpha Channel

Fill with the dark color

  Layers – New Raster layer

Fill with the pattern, same settings in memory

Blend mode Overlay -  opacity 85%

Layers - Merge - Merge down

Effects 3D - Drop shadow  14, 10, 35, 35, black color - uncheck the bottom box

9 -  Layers – New Raster layer

Selections – Modify - select  selection borders - same settings in memory

Fill with the pattern, same settings in memory

Layers - Merge - Merge down

Selections – Select none

 10 - Effects Graphic Plus - Cross Shadow

 11 - Layers – New Raster layer

Selections – Load / Save selection - Load Selection 3 from Alpha Channel

Fill with color  3

Layers – New Raster layer

Fill the selection with the pattern

Blend mode Overlay -  opacity 85%

Layers - Merge - Merge down

Effects 3D - Drop shadow  14, 10, 35, 35, black color 

 12 - Open "fondmer2"  Erase the watermark

Edit – Copy 

Edit - Paste as a new layer 

Selections – Invert

Press the Delete key on the keyboard

Selections – Invert

Opacity 60%

 13 - Layers – New Raster layer

Selections – Modify - select  selection borders - same settings in memory

Fill with the pattern, same settings in memory

Layers - Merge - Merge down

Edit - Repeat Merge down

Selections – Select none

Effects 3D - Drop shadow  14, 10, 35, 35, black color 

14  - Effects Graphic Plus - Cross Shadow

 15 - Dodge Brush Tool(J)

With these settings

Make one or two left clicks (to lighten) on the top left part of the layer

And one or two right clicks (to darken) on the bottom right part

 16 - Do the same on the two square layers below

Move to the top layer

 17 -  Open "dauphins"  - Edit – Copy 

Edit - Paste as a new layer 

 do not move - it is well placed

Opacity 90%

 18 - Layers – New Raster layer

Selections – Load / Save selection - Load Selection 4  from Alpha Channel

Fill with foreground color

Effects -  Textures effects -  Weave - background color

Selections – Select none

Effects 3D - Drop shadow  3, 3, 35, 10, black color

Layers - Duplicate

Select Tool (k) Position X 230, Position Y 160

 19 -  Open "corail blanc"  Erase the watermark

Edit – Copy 

Edit - Paste as a new layer

Image – Resize 32% all layers not checked

Place in the bottom

Opacity 90%

 20 - Add your watermarck

Delete the bottom white layer

Layers - Merge - Merge visible

Save Png (do not flatten)

 If you want, you can send me your version 

 If you have problems, or you find a not worked link, write to me

Une autre version avec un tube de Lisa T

Thank you so much Kika