Big pictures are BAD, you're going to run out of vram awfully quick. you should scale down your images and resize the sprites they're in back to the larger size (in the layout editor, not in the picture editor), itll be a bit blurry compared to the original but will be much easier on the gpu, so you can have more objects/images/effects and stuff going on rather than one sharp picture whoring everything not really making the game interesting at all. if your pictures are bigger than like 1024x1024, generally that's kinda bad if you're going to have many of them, and anything bigger than that size will automatically be considered a 2048x2048 image which is REALLY bad. try to keep the dimensions within power of 2 sizes like 1x1, 2x2, 4x4, 8x8, 16x16, 32x32, 64x64 etc. I know it may seem confusing, "why should i make my game look crappier i have modern hardware" but it's just a reality of game designing, you have to make things efficient, and doing that is no different than what pro's do.