hey PhantomK! Great to see you here. First of all, this is almost spot-on, but there's a few things I feel I should mention:
The shirt feels awkward, like it's been shaded the wrong way. I think you should try and emphasise a fold or two in the shirt instead of making it a complete blob of color. The arm also feels a bit stiff, I think you could try another pose for it, but either way, good work, you are definitely getting better!
Nice! Inspired me to make my own trainer,lol (I'll link you for that)