Lakenan: Per bend Gules* and potenty argent and azure; two rosed barbed of the first and seeded argent in bend sinistre and in canton a thistle of the first.
If you change the color of the upper-right background, it will work better and not violate the (traditional Anglo-Norman) rules, since the roses and the thistle are essentially the same color as the upper right background. The simplest change would be to make the upper-right background Yellow/Gold ("Or"), which corrects the problem for both the thistle and the rose. Other than that color issue, however, this is quite good as heraldry.
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Lakenan (revised): Per bend Or and potenty argent and azure; two roses barbed gules* seeded argent in bend sinistre and in canton a thistle gules*.
* Note that this color (which I've blazoned as
gules (red) could be anywhere from gules (red) to
purpure (purple) to
sanguine (blood-red) or
murrey (maroon); it's not quite a "standard" blazonable color/stain.