Picture turns Pixel

So I just started using this and so far my video came out perfect except 1 problem. I’m using the program for speed art. When I add in the final drawing as a picture, it looks great in the program. But when I export it, the photos at the end come out all pixel, which looks horrible for the ending. Is there a way to fix this or do photos not work with this program?

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They are fine.
‘Video’ is also photos, just 25 or 30 of them in a row per second.
You must prepare your pictures before importing them so that they will match the resolution of the video mode you have set Shotcut to use for your editing.
Also you must export to the same video resolution and of high enough quality to retain the detail you want.

Spend a little time going over the tutorials and the many help videos on YouTube regarding Shotcut.