Hello and welcome! It looks great. Is it a bin cage? Syrians like plenty of variety and places to sit in and under without too much open space, so I would think about adding a few more things to fill it up a bit. A good house that’s dark inside is important as others have said. But she maybe already has a nesting place she’s happy with? The one thing I think is important is a platform or shelf. This really adds to their enrichment. It gives them something to sit under and feel secure, plus somewhere else to go - eg climbing up to the shelf. It’s also a good place to put heavier ceramic items like a food bowl or ceramic hides - so they don’t sink in the substrate if tunnelled under - and that in ifsekf frees up more floorspace to add another tube or tunnel or hidey place.
It can be harder with a bin cage as now bars to fix a shelf to. But you can make a platform quite easily or buy one. Some people use IKEA Knuff magazine racks as well (Google Knuff hamster shelf and click on images). They are easy to make without much diy but you may not have space for that. A simple one is just a shelf with some dowel legs glued on. Stable access to the shelf is needed too - a secure ladder or tube that is securely fixed.
If you don’t have room for both a large hiuse and a platform I would prioritise the platform - they do much better with some overhead cover and that extra level. And a medium house. Any decent house with a bendy bridge over the door to make it dark inside is fine. You can just make one out of a tissue box or small shoe box if funds are tight. The note angel ones are lovely but cost money