i like to do a quick rig and put them in the same pose and then check it that way. It can be difficult to gauge if its in a different pose.
Just glancing your proportions look fine to me. I'd caution to avoid getting out a millimeter measuring tool, but rather zoom out and make sure you are getting the artistic character of the concept communicated above all. That's easiest to do viewing it from a distance so that you don't focus in on details.
you might find it a little easier to make changes to the proportions if you do a quick retopo so you can work on a very low poly mesh at this stage. Also getting the chunky angular feel to things like the armor and shoes is easier with low poly modeling.
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Just glancing your proportions look fine to me. I'd caution to avoid getting out a millimeter measuring tool, but rather zoom out and make sure you are getting the artistic character of the concept communicated above all. That's easiest to do viewing it from a distance so that you don't focus in on details.
you might find it a little easier to make changes to the proportions if you do a quick retopo so you can work on a very low poly mesh at this stage. Also getting the chunky angular feel to things like the armor and shoes is easier with low poly modeling.
Here are my two cents: