Help choose plants

I have just finished this 20 that I am planning to put thumbs in. Any advise on plants that will work in this design would be welcomed.

It looks like I will have a shaded area on the right side in the back. Also I would maybe like to have an orchid planted on the limb that juts out to the right up high.

If you know where to find your suggestions that would be great also.

Thanks
Bo