overlap one image with another image in SSRS

Hi,

Actually, I have set one background image to report1.rdl, Again I have placed anotherArrow mark Transparent Image in the report1.rdl.

Problem:-

When I export to PDF then Arrow mark Transparent image is showing as blurry. If I use high Pixel's image then circle of the image is coming black dots.

I need to Overlap one image with another image, so when I'm trying to do this I got Pixels issue in PDF file.

Please tell me how to solve this type of issues.