[Jten]

Photoshop? Good work.

Are you applying the texture as a top layer (overlay or screen) or displacement map?

If it's losing effect after resizing (and your texture is a top layer) try color burn and reduce the opacity a bit.

You could try filters>texture>texturizer try canvas or burlap and adjust the scaling and relief.

If you want the flag to actually conform to the rise and fall of the material shown in the examples you need to use a displacement map in addition to the texture effect.

If theses are static and not going to have dynamic lighting applied you might want to try filters>render>lighting effects to contrast the light/shadows for depth effect and burn the textures in. If you mean the flags waving on the mast tops then a flat texture without any 'sag' might be better since it might fight any render lighting effects.

These effects are possible in other raster based applications (Corelpaint, Gimp, etc) but they may change the tool names.