[Becco_UK]

I don't know what is causing the white dots but a slight blurring of images has been introduced in the recent Beta and hopefully will be cured in next weeks expected updated - hopefully the dots of all colours problem may also soon be sorted out.

[rivoli]

in the render view what for is the image / mxi?

the mxi viewer can be used to convert a low range image (bmp, jpg, tif, png, tga) into a mxi image (which is the high dinamic maxwell's format). you can then use this image as an mxi texture for emitters.

as for your image, it maybe needs a bit more work on the seatings (both modelling and shader). those white dots looks like caustics to me, but this beta has some dots problem, so i'm not sure.

[rivoli]

those seats seem to lack detail (as if they were just bidimensional sheets), but maybe it's just me. i think some roughness and a fine bump map might help as well.