Yours looks okay. Very dated bathrooms (coloured suites etc) put people off or mean you have to charge very low rent and can then attract the type of tenant who won't look after it....not always the case of course.
It depends how competitive the market is where your property is. If there are tenants queuing up for your type of property, the bathroom is absolutley fine. If landlords have to really fight to get tenants, then a opening like a lovely bathroom will help. If you were installing for rent, it's important to consider the type of market you're aiming at and the price-level too. Even in a cheap rental there no point going dirt-cheap as the quality means it won't last, but you won't need the frills that might be necessary elsewhere. It is obvious really, but some people do get in wrong and either install luxury bathrooms or kitchens in cheap rentals where they just aren't needed, or don't go high-end enough in expensive properties, which then lets them down.
Looking at the pics of bathrooms in similar sized and priced rentals in your area on Rigtmove will give you an idea of what the local market is providing and people expect...it can vary by area. But I wouldn't think the one in your pic will be a problem....it probably won't give your property the wow factor and attract a large excess of viewers, but it won't be a pic making potential tenants immediately move onto the next property on Rightmove.
If you install a new one now, the work will delay it getting to market and given what might suit you when you live there might be differ from what would be suitable for a rental, you don't want to do it twice. If it was a horror of a bathroom though, you'd have to do it. Tenants deserve (and pay for!) decent bathrooms and kitchens and making sure they are in the property is just a cost landlords need to bear.
I haven't generally replaced kitchens or bathrooms during a tenancy but between. I wouldn't let a property with a bathroom or kitchen that wasn't decent, so I wouldn't expect to have a replace a whole kitchen or bathroom mid-tenancy, although of course odd bits can break/damaged and need replacement immediately. If there has been a good, long term tenant who has been around a couple of years at least and is wanting to stay, I'd certainly be willing to spend some money on sprucing up and decorating if they would like it done (not all want the disruption) because keeping good lomg term tenants is definitely worth spending a few hundred quid on, because the costs and hassle of getting new tenants is far greater. Wouldn't expect to install a whole new kitchen or bathroom though unless a tenant extended far beyond the norm in a very unexpected way and I've never had that kind of length of time where it would be needed.
If your bathroom is good for another 5 years, then don't do it now, but if you think it will only be good for a couple more years and you might be renting longer than that, consider it now.