Looking for advice on how to improve this and make the frog look more realistic. It still feels a little plastic-like to me. I don’t love the shallow depth of field either but the background didn’t look quite right. I just put a forest image onto a plane. I will probably work on that to some extent as well. It just looks really flat at the moment.
Try photoshop or compositor for make it look what you want. To make a frog less plastic, research about it, it very helpful.