What are the pixel dimensions of the image? I can probably find the DPI density from that.

Imo I’d do this in illustrator

Right, we need to know “Pixels per inch” or (when printed), “dots per inch”. They are technically different but for modern practical purposes, the terms are used interchangeably. 144 is a decent goal to keep in mind to try and avoid an image looking like crap.

Simple recreate it & separate colors in AI save pdf for press. Do you know the exact spot colors?

This will be a six color process job. Social media icons you can find on https://www.vecteezy.com/free-vector/social-media-icons

Not to critique but poster could use some adjusting so it’s properly proportional & btw you never need www.

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I'd like to learn more about photo/image manipulation tools like PhotoShop. The learning curve seems quite steep.

With the exception of simple functions like "sharpen", I contend that it is impossible to gain resolution. Clarity can not be made from fuzziness.
The movie "No Way Out" with Kevin Costner depicts using an algorithm to "clean up" a fuzzy image, the reverse of a polaroid instant film image. I always think, "that would be nice, but it's not possible".

You pros, please school me.

I'd think the only real solution is to redraw this image in a scalable format.

--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
https://www.youtube.com/c/ChrisHiblerPinball
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Needs a few tweaks... but this will print to specified dimensions @ CMYK 300DPI

Penn-Yan-Flying-Club-poster-24X36-01 (resized).jpg

Minor typography quibble — rework the dashes — https://www.thepunctuationguide.com/en-dash.html

I would never have know that there are, in fact, three variations of the dash. Thank you sir.

—
Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

Understood. But it’s difficult to tell if people just want help or, if they want to be able to learn the process so they can eventually do it themselves. Making posters is fun to me, right along with repairing pinball… I’m sure others think they are both boring and unrewarding. The biggest thing to understand it using the right programs and techniques makes things a lot easier. As others suggested, Photoshop is best used for photographic images that already exist, Illustrator is better for the creation of things that do not yet exist.

I'm always available if anyone wants to learn we can do Google hangouts I've been doing desktop publishing/design for over twenty years.

It certainly is easy to be overwhelmed when beginning to understand the software/terminology. The big take-away is that you don't need to understand everything in that program (nobody does) just master the tasks you need or what the project requires.

Unfortunately/fortunately you can't always accomplish the same tasks in the same application. It's good to have a basic understanding of at least one vector(Illustrator) & one raster(Photoshop) application even better to have layout application(InDesign). Basically, P-Shop & Illustrator are typically programs to create assets to be used in the composition & every project is rendered out through InDesign.

Lastly, technique always adhere to the less is more the less flourishes/decorating is always best the human eye instinctually looks for organization & patterns. Function always over form & always try to keep proportions 3rd/5ths applying a grid to your layout always helps. There are several different ways to apply the Golden Ratio which acts as a guide to keep every element proportionate to it's neighboring element typefaces, imagery etc. Lastly, stick with just a few Typfaces H1 - HX, Header(H1), sub Head(H2) & paragraph(H3) etc...; colors it's typically not necessary to exceed a three to four color palette depending on the brand or what's appropriate for said project.

golden-ratio-rectangles-680x437 (resized).jpg

To achieve 24" x 36" at 300DPI you will need an image resolution of 7200×10800, by the way.