Why did Adobe reject my photos for quality issues?

this is shot on Iphone17 and no processing done.

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And it looks like it. Stock photography is much more than point & click.  Digital photos require some post-processing to correct mistakes.

• Leaning horizontal & vertical lines are easily cured in Photoshop with the crop/straighten image tool. 
• Other distractions can be removed with advanced selection & removal tools. 

This is what you’re competing with in Stock inventory:

https://stock.adobe.com/search?k=icicle+photos

Composition is an issue in both of these. The eye travels around the frame searching out the focal point. Be very deliberate in how you frame the image to remove distracting elements and display the main subject clearly. Virtually all images require editing prior to submission. Images straight out of the camera are rarely going to be acceptable.

Exposure needs adjusting. The photos are not level and both are not properly composed.

Hello,

One thing that sticks out to me is your composition - it’s messy!

Composition - the basics of photography composition

(From Adobe)

Shooting for stock requires careful thought about your subject, and what you what to take, why, purpose and so on.

Composition comes under the heading of quality!