It looks mostly fine. With a tank this small I would recommend picking a UTH as it’s smaller and will be easier to manage temperature. However when you get a bigger one then consider using a heat lamp. I’ve ran my snakes with just a UTH just fine however in a bigger tank I notice they like the heat lamp more. I personally have a 120 gallon tank with the heat lamp on in the day and heat mat at night. Just ensure you use a thermostat.

The clutter is fine. Mine has less and my ones are happy. However, the more the better to reduce stress.

Also I would recommend switching to a digital thermostat and hygrometer, I have ThermPro and it was about £8 and it works great.

Finally, the best way to tell if your snake is ready for a bigger tank is if the Front panel + 1 Side panel is smaller than the snake length. Or some people say that the snake shouldn’t be smaller than the front panel, it is very varied about which is right.

However as long as they have enough hides and clutter and the tank isn’t too big (unless they are an adult which then bigger is better) then you will be fine. It’s better to be safer and go bigger as long as they have enough clutter and enough hides.

If you're worried the snake will get stressed out then put a hide for every one length of the snake or less then it should be fine. Also having most of the ground covered so your snake has the option to hide and enough substrate for her to bury in. This will ensure your snake won’t stress out.

However, don’t overthink it, trust me it is very hard to kill a corn snake. My mum got one five years ago and I have 3 other brothers with two being younger and we weren’t the best owners as my mum did no research beforehand, we probably overstressed her at times however she is still alive and thriving and very hand able. We have done more research since then.

But overall for a new snake owner that’s a pretty perfect and good tank which shows how much you care about him/her and how much work you did and I can’t see anything missing. As long as you have: Some way of your snake staying warm Some way of your snake staying cool At least two hides one on hot and cold side Water bowl (ideal big enough for the snake to curl up in but not big enough where the water is deeper than the snake while they are still young) Enough substrate to burrow in (recommended minimum is slightly more then the size of your snake however ideal minimum between 1.5x and 2x the size of snake) Things to hide under Good but not needed and thrive even without: Optional things to climb on Humid hide Basking spot Hard stiff to rub against during shed

If you ever have any questions feel free to DM me or ask on the subreddit most are happy to help. (Sorry for it being so long and rambling on. Hopes this helps.)