Something about the mud just makes me go Â
It just appears like you have gone in photoshop, selected a light brown and just clicked the brushes down (Something I'm guilty of doing before). Without really taking into consideration the edges, hinges, handles, cracks and the fact that dirt will have lighter and darker spots, also another thing to keep in mind is that within arma this vehicle is going to be most likely used in desert, temperate and wooded maps you'll need to find a happy medium to suit them all (unless of course you have different versions, but that shouldn't be necessary)
It does look good the majority of mud spots etc that arn't covering a detail instead of 'complementing' one look good.
Hope you don't take it the wrong way. I am trying to help Â