@Jafo looks real good what program do you use to skin them is it based on a 3d model if so do you wrap it with texturesor simply paint it directly ?
FSX plane skinning is [mostly] an extensive series of DDS Alpha channel 'bitmaps' [compressed - DXT5] or extended 32 bit bitmaps 888-8, combined with additional bump-mapped images and specular shine images. That plane has 130 bitmaps.
Tools used are simply PSP6 and a proggy called DXTBmp used for converting between formats. Some models have 'paintkits' in PSD format with several layers for rivets, panel lines, etc so I also use Photoshop Elements  for those.
Texture aligning can be at INDIVIDUAL pixel level, and whether it's a bezier curve or a push brush, the closest thing to a 'filter' is applying overall changes to colour saturation or lightness, etc.
The texture 'mapping' of the models varies and many induce 'distortion' when 'flattened' to 2D...so that requires 'practice' to overcome....