To TileImage or Not To TileImage

ATM Im doing a parallax effect with TileImage on a 800x600 screen.

Ive got 4 images all 800x600:

Background - jpg
1st Mountains - png
2nd Mountains -png
Ground/Tress - png

Should I continue using tileimage or should I make the images smaller and draw multiple of them to create the effect?

Thanks!