Yes there is a problem with the images for the vBulletin forum software. They have some arbitrary 5K max size so if you got a 4K one then it would work. I'll have a look now.
Very nice. Very clean lines - inkscape ? I could read most of the french but then it went into latin and I lost it. Lots of Welsh sounding names on there too. My only crit is with the sand on the dunes which has some horizontal lines on the texture. You can usually fix that by taking your dune texture and putting it down about 3 times at different and mismatched scales. Like 1:1, 1:1.7 and 1:2.3 or something like that - prime numbers are best. Anyway, that breaks up any pattern in them.