Deep Blue Fish

Used too many GIMP effects to mention.

Deep Dark Fish

Grey version of the above.

The G’MIC plug-in with its Rendering and 3D extrusion

 

and image object can produce some interesting effects.

 

Cliff in Winter

just added a few more gimp effects.

Cliff

Cup Of Flowers

Haunted

This one is too complicated to even begin to explain.

Adding Emboss and Bumpmap to the background layer. A bit of Map and Fractal Trace to multiple the foreground.

Yet more effects to chase up.