The top 4, I mentioned in my last reply will ALL do everything you seek.
It just comes down to sheer plethora of features that each of these apps has and which ones will be more, or less, useful to you.
Affinity Photo, Procreate and Art Studio Pro have a ton of features.
ANY type of design/graphics software you decide upon is going to have a learnng curve.
Serif Labs, which make Affinity Photo and Designer for iOS/iPadOS, macOS and Windows has a great Website and both online and priint book/manual support.
https://affinity.serif.com/en-us/
Also, Serif Labs and all their Affinty apps and video tutorials can be found on YouTube.
Tap the links below.
https://youtube.com/c/Affinitybyserif
Procreate has an excellent online website and downloadable Book manual to download to your iPad.
Tap the links below.
https://procreate.art/
https://procreate.art/support
Art Studio Pro has an user Interface that is VERY Adobe Photoshop-like.
So, IF you are familiar, at all, with Adobe Photoshop, ArtStudio Pro will be very familiar.
Lucky Clan that has developed by ArtStudio Pro for iOS/iPadOS/macOS has a Website area for full support, tutorials and user support here.
http://www.luckyclan.com/forum/
Pixelmator for iOS support can be found here, as well.
Tap the links below.
https://www.pixelmator.com/ios/
https://www.pixelmator.com/community/
https://www.pixelmator.com/support/
Good Luck to You!