GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
GIMP - Feature Overview
How To Make GIMP Look and Feel Like Photoshop
Top 11 Alternatives to GIMP in 2024 (Free, Open-Source & Online)
GNU Image Manipulation Program (GIMP) Review
GIMP Review: A free, open source, powerful image editing software
GIMP Reviews: 1440+ User Reviews and Ratings in 2024
GIMP: Case Study An Authentic Review of GIMP
GIMP Photo Editor 2024 Premium Professional Image Editing Software CD Compatible with Windows 11 10 8.1 8 7 Vista XP PC 32 & 64-Bit, macOS, Mac OS X & Linux – Lifetime Licence, No Monthly Subscription
10 Reasons to Use GIMP Over Photoshop
GIMP (GNU Image Manipulation Program) Software Reviews, Demo & Pricing - 2024
GIMP Photo Editor 2024 Premium Professional Image Editing Software CD Compatible with Windows 11 10 8.1 8 7 Vista XP PC 32 & 64-Bit, macOS, Mac OS X & Linux – Lifetime Licence, No Monthly Subscription