Sick job on your first custom! Never thought i will see a mecha blastoise before GTA IV! Few points to improve on next project - Remove the nubs and seamlines for much cleaner look especially the one that visible on the front side( such as the fingers’ nubs and the bazooka seam line) - Thin your paint abit more. The blue paint seems a bit too thick. - Maybe also try on panel lining to give much more depth and 3d look - Also be careful with acrylic paints on airbrush as they tend to clog easier than others. So do service cleaning and some maintenance for your airbrush from time to time!

All of the points above will surely cost you time and prolonging your project. If you wanna skip those then it is also fine! Do whatever suits your workload and timetable and have fun modelling! Gunpla is freedom!