its o.k but it looks too um basic like all you did was put a render on a background and did some lighting
I did quite a bit more than that. Im also a beginner when it comes to making sigs, I've been doing renders longer. But, I threw on a couple gradiants, some brushing and a couple other little things.
Looks indeed abit basic, but there's nothing wrong with that . I like it, maybe try to blend abit more.
I changed some stuff messed around with some things I didnt even know were there until now that can drastically change it and came up with this.