Motorola V80

Just purchase a Motorola V80 and am having some problems. I have uploaded some wallpaper into phone that I used successfully on my V600 and it looks terrible on the V80, size is 175x220 pix.,looks like a pic that has been enlarged too much... tried to resize it to larger size in photo program and reload ... still looks terrible..tried changing the resolution on phone to all choices up to 640x480 and looks terrible.looks slightly better if centered but are small....tried several different wallpapers and all do the same thing. the motorola factory installed wallpapers dont look bad...anyone else have this problem and know the answer??