no flow or depth, theres a problem if even i can see that.
the lights create a sorta triangle thing which doesnt work
lighting doesnt look natural, or in fact logical.
text is distracting, practise some text based sig thingys or remove it entirely.
render is only connected to the background by colour, no linking elements or effort made to relate the two.
the entire thing seems empty, it may as well be an avatar of just the venom head, rest serves no purpose, adds nothing to it.
Please learn some basic sig tricks/tools/functions, dont just sit at the same level, improve or something