Max texture size should be no larger than the largest dimension of the largest texture map. Including the background image, if you're using one. The best way to calculate the right texture size? Well, the body height (feet up to neck in zero pose) is probably the best guide. If that length is 1/2 of your scene size, the texture map should be about 1/2 of your scene size too. If you render to 5000x5000 px, the texture map sizes calculated this way could be pretty large. And in that case the chances of a successful render at decent quality settings are rather slim. It could be a good idea to make a series of maps. Say the largest map you have is a 4000x4000 map (not unusual for V3 or M3). You could try making a series of maps from those like 2000x2000 and 1000x1000. I'm fairly certain a V3/M3 scene with their full size texture maps will not render in P6 at 5000x5000. Especially not if you're also using clothes and/or background props/figures. Try the 1000x1000 maps with HyperReal and AO. I'm fairly sure the skin will still look crisp and detailed due to the granite and spots nodes. And the chances that it'll render to completion are hugely increased. Background props and figures are also prime candidates for texture resolution reduction and adding procedurals. And don't forget the hair - most hair has high res textures requiring a low shading rate (0.2-0.5) to render decently. If you're using 1000x1000 texture maps, I'd recommend setting max texture resolution at 1024 (usually Poser likes a power of 2 better than any other number). And if those 1000x1000 maps don't look good enough, you could try for the 2000x2000 maps. But the chance that Poser will run out of memory will increase...

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