The Knights at White Castle seems the most exciting to me, but really all of those are great.
the knights in front of castle reminds me sword and sorcery covers of which I favour. I also think that fantasy is the most common roleplaying environment and best sums up role playing.
May I ask who the artist was for 'Orange warriors on the battlefield' and 'Warriors clash in front of the white castle'? Those really REALLY rock!
Was a toss up between 'Orange warriors on the battlefield' and 'Warriors clash in front of the white castle'. White castle (not to be confused with the fast food chain) won out because it reminds me of the Erdea Manor logo/header.
I really prefer the dice to all the other options. Dunno why, they just seem right.
That first one gave me a Twilight vibe is all. I don't know why, probably because I didn't see the tentacles until after. They all look good though!
Honestly, it's a really close run thing between the "Orange Warriors" and "Clashing Warriors & White Castle" but both need the text to have more contrast, either a change in fill colour or an edge blur. Just sticking my tuppence worth in, keep up the great work.
I chose the Warriors Clashing in front of the white castle, first it has a castle which relates to all your mapping. Second it has a simple, yet clean hand drawn style which meshes perfectly with your style of drawing IMHO.
Those are all great - i voted for Orange Warriors, but i'd be perfectly happy looking at any of them at the top of your page.
I do wonder if the orange warrior image might look better reversed - the foreground warriors on the right and the little background dudes on the left. But i'll be the first to admit i don't know what i'm talking about...