There are so many similar looking Oncidium species and hybrids that without a tag, it's not very feasible to accurately ID from a single photo with little to no accompanying information.
If this is a wild plant in its native habitat, you may be able to do some research and come up with a reasonable ID. You'd need to provide some information like size of the flowers, spike, leaves, bulbs, roots, etc as well as location information like elevation and country/region of origin. If you have them, clearer photos with close ups of the flowers "face on" as well as photos of the foliage might help as well.
If these are flowers in a garden or from a vendor, then ID without a tag is almost impossible. The best chance of getting an ID in that sort of situation is if the flower is fairly distinct, in which case it can sometimes be obvious that it's a recognizable species or a specific hybrid. However, small yellow Oncidiums with a disproportionately large lip and chocolate bars on the diminutive petals and sepals are practically indistinguishable and tough to reliably differentiate.
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