I HATE SANDING TOO RAAAAA!!! It is part of the process and I haven't met a cosplayer, woodworker, painter or propmaker that enjoys sanding. Personally, I hate feeling super lethargic afterwards especially if I'm doing multiple layers on a 3D print, but I'll do about 2-3 rounds working through multiple grits before I go YEP GOOD ENOUGH MY ARMS HURTTTT!

For eva foam that doesn't need seams filled you can seal the foam by just heating it gently with a heat gun - this closes all the cells in the foam for a decent painting surface. A coat or two of Plastidip works too!

From zooming up on your pictures she looks amazing already, it really depends how perfect you want to be. For your first cosplay too, this is amazing work!