Iray render - blurry in photoshop [zoom]

Hey guys!
I've added a simple model to the scene in DAZ Studio (genesis 8 - Ai https://www.daz3d.com/ai-hd-for-genesis-8-female), posed her and rendered just as it is - no lights, clothes, backgrounds or anything. I'm a photoshop artist so all I really want is the model.
I have my Iray settings according to greymouser69's answer in this thread https://www.daz3d.com/forums/discussion/163416/optimal-iray-settings
The problem is as soon as I open the png in windows photo viewer or in Photoshop, if I zoom she quickly becomes blurry... Is there a way to prevent this from happening? Something in the settings?
I have Iray set for rendering the viewport...
thank for any help you can give! =)


Screenshot (9).png
1920 x 1080 - 441K


Screenshot (10).png
1920 x 1080 - 595K


Screenshot (11).png
1920 x 1080 - 550K
Comments
I think rendering at a higher resolution is the only way, it will still pixelate on zooming in at a certain point, but not as soon(in photoshop, window photo viewer is not really that great). Also, I find using mitchel filter at like 0.8 - 1.2 instead of gaussian helps a lot.
When you say higher resolution do you mean rendering quality in the progressive rendering menu? I can't seem to move that... it always pulls back to the same spot.
Also (sorry I0m new to this) what is mitchel filter?
For resolution, it's in the render tab > editor tab > general and pixel size(global). For the filter its in the render tab > editor > filtering section, called pixel filter, it's a dropdown, and the radius is right under it. Normally I would take some screenshots, but got a render going lol.
No worries ;) this already helped a ton! I've got the rendering going now and will see if it looks better! =) thank you!
Sorry I'm not at my Daz machine to give more specific instructions, but try changing in the Render settings tab the (pixel?, not sure of name) filter from default gaussian "1.5" to mitchell and the setting to "1".
Can't remember what post I stumbled across this but I found using the Mitchell filter got rid of the blurriness for me.
Thank you so much to both of you! Everything's working great now! ^^