Welcome! Why is everyone Dutch here?

Like the others have said before me, you have a nice and clean illustration style going on there.

The island itself seems pretty basic, though you might have been going for that. Some simple additions you could use would be sand dunes on the coast and such things. Additionally, the main road in Pendor going from the Growlow Forest to Port Al is a nearly direct line in between the towns that are on the way, which all have their own access roads splitting of from it. To have some variation in this respect, you could have the main road lead directly to one of these towns, and then continue on from there.

To make it pop out a bit more, you could go hunting for some nice high-res old paper textures.

That's all my suggestions done for, hope to see more!