This is just my impression, but the abdomen looks a bit short and puffy.
I also personally feel that it's strange that the cockpit circle tends to be hidden by the upper body when it's in motion.
First, cut the connecting base of the upper body cleanly, then sandwich a runner plastic sheet between them and re-glue.
That's all it takes to extend the abdomen. So easy!
I used three sheets, so I guess it's about 3-4mm?

HGUC Gelgoog: Fuselage Modification | jun_kamioka's Gunpla works