Thanks for the comments guys,
This week I masked the underside with Tamiya tape,
Then sprayed 'bs dark earth' (vallejo 71.323),
The dark earth was masked with Blu-tack and pieces of Tamiya tape,
Then I sprayed 'bs dark green' (vallejo 71.324), I always have a hard time with this color as it takes many layers to fully cover...
After unmasking I had these almost yellow featered edges - I had this issue in the past as well, it's a combination of 'too tick' blu-tack sausages and not enough passes on the masked edges (as the green paint covers very difficult)...
It did bother me too much, I kept looking at it... So I restarted masking again with blu-tack, but then got frustrated and grabbed me a brush... With the brush I repainted the 'dark green' edges again and quickly tried to blend in the 'non-edge' brush stroke...

I also found the dark earth a bit too light, so added small dots of 'Winton oil color - burned umber' onto the brown camo and blended it like a filter to deepen the brown somewhat...
It always looks funny without markings, after curing I'll add a gloss coat for the decals.
Thanks for watching, cheers