I'm assuming similar...It may not be a gradient at all, but rather hand-drawn since it looks like more of a vignette to me. The lighter areas follow the shape of the bottle to some extent, which I would assume comes from manual retouching.
Not at all. Use Illustrator or another vector program.Is adobe Photoshop recommendable for logo design?
I know you have got the solution, but that is important to keep in mind that if your work is for the web, then you should rely on Raster Graphics Editors, otherwise vector programs are considered suitable.
but if you are creating a logo design for web at some point they may want to print this.
Vector should be used as you can convert/save as a raster image. also, svg files are supported online
Yes, I agree with you, but when it comes to the question about the size of the logo, the matter is not very easy. And vector is more applicable in the world of printing, I meant.