I think they are generally pretty nice, though I think it would be a good idea to include a coloured version for each of them.
For the Pelican logo, I would look into some different fonts, the one you have chosen doesn’t really fit in my opinion. The water ripples look more like a target than ripples, so maybe try breaking it up a bit or adding a subtle wave to the shapes to make it more water-like.
For The Beach and The Windmill, those might work better as illustrations, and the text is pretty small, especially when you start shrinking them down to business card or letterhead sizes. If you want to use those as logos, I would shrink them down to about 1/2 inch in width, then start deleting/adjusting any small detail that looks messy, while also adjusting the size and line thickness for each element so that it all looks clean and clear, including the text.