Where does the design comes from ? is it your own ?
There are different ways to improve the model, it’s even possible to make it better without even doing much to the character !
I think the whole character would work better with a pose and context.
Is this mountain troll supposed to be dangerous , mean, friendly ? The actual pose make it quite inoffensive and kinda cute. The high camera make it also look quite small.
But a nice pose, putted in a mountain environment, with more clues about who is that mountain troll and you’ll get a much more convincing character !
A lot of stuff goes into how do we “sell” our stuff to an audience, presentation is a big part of making things looks cool.
Model is cool but something is lacking isn’t it ? :
Your model is kind of stylised / cartoony , is it intentional or you wanted to make something more realistic ?
Yes the model can be improved, but presentation helps a lot !
An average or poor model can become quite cool when presented well.
On the opposite even the coolest model can turn to look cheap with bad lighting , wrong camera …
But maybe you’re more into modeling and texturing at the moment and don’t want to feel overwhelmed by new stuff !