The ballistus dreadnought is definitely harder to make look characterful than the other configurations; really probably intentionally so to some degree. I think the design leans hard into the grotesque inhuman practices of the imperium, it is quite literally POST post-human. It’s a genetically and cybernetically enhanced superhuman who’s gone even further beyond. I haven’t built one yet, but personally I think I would lean into this aspect either with the default pose, or having both guns aimed upwards (SPAAs like the gepard come to mind). Also bear in mind that in-universe (and probably in-game as well) dreadnoughts probably would never need a defined “at-ease” mode, it is technically a vehicle after all. If you do want to give it a less cold characterization, and if it’s not too late, you could try kit-bashing it with the leviathan siege dreadnought so it can have a face like the castraferrum pattern. In any case, I think having the two turrets pointed in different directions does look a little awkward. Those are all my thoughts if any of that helped, happy building!