Well, your code seems to do what you want to do. I don't see how sliderValue changes, though.

your loop variable, i, goes from slideValue to 100 - so if slider is larger then you get less images draw. so it will affect it.

I think i'm explaining it badly....

If the slider value is 50 then it should draw the image 50 times. If the slider value is 10 then it should draw it 10 times and so on....

Thanks for the replies guys! However that loop just keeps drawing one of the image but in random positions. I need the images to be static, and the number of these static images determined by the slider value. By having it called from draw() it means that every frame drawn the image is in a new random position....

In this case, have a global array of PVectors (or two arrays, one for x pos, the other for y pos) to hold the positions of the images.
On slider value change, fill the array with new random positions and use the array in the translate() call: the positions will be stable for each draw() and change only when the number changes.
Or if you want all positions to be stable, compute the random numbers in setup() once and for all.