I have never used photoshop before because I find it very complex. But I am hoping to have a formal training about it in the future.
Do not worry about not being able to link the source because it is very clear in the process that you made this artwork.
Light and shadows really would make our artworks stand out. But, we can not learn it instantly. We need to have more practice until we can really apply it on our work.
But I really think you did great in this artwork. I hope to see more works from you. 😊 So, ill have to follow you.