This sig seems like it would be a lot better if it were about half as wide. You really only put things on the left side of the sig. The right just seems quite empty.
You can see the edges of your C4D's. Use a soft brush and erase the edges a bit.
The render doesn't really fit the background. (Spiderman doesn't live in space, in case you didn't know

)
Text placement seems like an attempt at filling the right side, although it failed.
The text itself isn't terrible. The reflection, however, could use some work. Erase the lower end of it with a soft brush and lower the overall opacity a bit.
Other than that there isn't much else. You maybe could have placed the render a bit better, but that is no big deal.
Decent job overall. Keep practicing

.